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Post Ad7TpcnInn4e14zeTY by [email protected] |
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More posts by [email protected] |
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Post #Acmi8T5wPHe6TWQsbY by [email protected] |
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wait a fucking second...it has been ZERO DAYS since I found an off-by-one error… |
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Post #AcmiHMfRfmRN9CHVwW by [email protected] |
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So here's the zoomed out (F1) view in Railroad Tycoon. It's supposed to… |
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Post #AcmiQwahTnabAUd70y by [email protected] |
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Here's some lakes north of Winnipeg. We can see that they go right up to th… |
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Post #Acmiot32Iu1R87IhDE by [email protected] |
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So let's hit F4 and zoom in and NOPE.The eastern part of the lake that goes… |
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Post #AcmiowAahGqcoPrGu8 by [email protected] |
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The zoomed-out view is missing a single line of tiles from the top of the map! |
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Post #Acmj13ONfb6qgf5OAC by [email protected] |
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SIDNEY K. MEIER, THIS IS UNACCEPTABLE |
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Post #AcmjGIoyaUsysnnTJg by [email protected] |
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@foone (*squints) So you found one yesterday? |
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Post #AcmjGItEKgHx5zmrwm by [email protected] |
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@flyingsaceur heh |
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Post #AcmjS9Y2tH4Db8WpTE by [email protected] |
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It does it on all 4 cardinal directions.I notice there's a white rectangle … |
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Post #AcmjSCFiprBzzAyjpI by [email protected] |
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I noticed another error: the code that determines which shorelines to draw brea… |
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Post #AcmjSD1vwbl0OhXEyO by [email protected] |
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This only happens on the West and South borders. The North and East borders are… |
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Post #Acmkb5M3wyhF9YkMO8 by [email protected] |
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apparently the save file grows by 4 bytes for every single piece of track you p… |
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Post #Acmku3aajt4pBAaZIu by [email protected] |
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I think I just found an off-by-two error?if you are in F4 mode and right click … |
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Post #Acml4MGq8Xxa0xGJjU by [email protected] |
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interesting: The game's internal coordinate system is a 16-bit unsigned int… |
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Post #AcmlGY2oBjwE0MVmoy by [email protected] |
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although the coordinates are... weird. Some of them aren't on the map, I th… |
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Post #AcmlP52PP2wOeJOR8q by [email protected] |
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yeah.So the point I'd call (1,0) is point 200.So 199 should be at (0,199) r… |
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Post #AcmliqaoopL5dluiLg by [email protected] |
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this would make some amount of sense if they were just stuffing the coordinates… |
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Post #AcmlqwidvRsSxPR3Eu by [email protected] |
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also why combine the X+Y coordinates into this idea of point numbers? the map i… |
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Post #AcmnyXH6bsmkGiIlZQ by [email protected] |
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okay, the 4 bytes added are encoded like this:16-bit ushort: tile number8-bit i… |
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Post #AcmoFKXPDfMrgivz0K by [email protected] |
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bridge types are set up like:00: tunnel01: wood10: stone11: iron |
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Post #AcmolQhTqJqk4Ex7zM by [email protected] |
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@crobbler something like 212,576 bytes? |
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Post #AcmpBBX4rJRCYRMrzc by [email protected] |
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track tiles are <63if the number has the 64 bit on, it means it's for th… |
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Post #AcmpfG4AZDSrIrBcMS by [email protected] |
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arg. all this starts at a fixed offset, except it stops being fixed if you name… |
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Post #AcmppGhd3VQCAmPswa by [email protected] |
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@crobbler it gets tight if you have more than one save, though, especially sinc… |
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Post #AcmpyY6JjrpCjrODku by [email protected] |
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if bridge types 1 and 2 are on (11), it means there's a station there. |
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Post #AcmqA5ogj19qUWeFgO by [email protected] |
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trying to figure out the naming thing in a highly scientific way: I keep rewind… |
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Post #AcmqbWZxKb4tJPq0NU by [email protected] |
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crap. I can't find any obvious header stuff that changes length based on th… |
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Post #AcmquHuk4vjtKfVWk4 by [email protected] |
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lemme hit it from the other end:maybe there's a header field that says how … |
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Post #AcmrGeIPXoD17RF03k by [email protected] |
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got it. offset 0x3738 is a 16-bit int of how many tracks there are.so we just n… |
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Post #AcmrXNfebpy6Tp5hlA by [email protected] |
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huh. I somehow bugged the game without even trying! I started a new map, connec… |
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Post #AcmrezHt9LPdAnbOFM by [email protected] |
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for some reason it thinks they both go way off to the west. |
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Post #AcmsrYAHP1EQlwb5ii by [email protected] |
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I want to test my theory on how railroad player numbering works, but player 3 r… |
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Post #Acmt1WqVA4D5Zr6XKa by [email protected] |
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FINALLY.yeah, it works how I expected. |
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Post #AcmtL31JlHp4rnTGBE by [email protected] |
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also my track number thing is wrong.that seems to just be for P1 tracks, so I n… |
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Post #AcoLR1Hi7SA360jbO4 by [email protected] |
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I found the other player's track count, which seems to store all the other … |
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Post #AcoM36mW88fV9GJ2h6 by [email protected] |
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I also found another bug: There's a limit to how long a train can pathfind.… |
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Post #AcoMDh9Zksteqk8ii8 by [email protected] |
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also the "miles of track" indication on your end of fiscal period sum… |
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Post #AcoNX9AZuqJvCFRpOC by [email protected] |
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interesting: the game doesn't defragment the track list. so if you build 8… |
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Post #AcoNuVPtMswir3kVI8 by [email protected] |
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and it never fills those spots back in, it seems. it just adds them to the end. |
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Post #AcoNuY7ZJT4VF6CPeC by [email protected] |
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OH MY GOD IT'S A BLOCKCHAIN! (/joke) |
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Post #AcoNuYtmQDdVeckunI by [email protected] |
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I have a bad idea:so the game stores saves in two files.the RR?.SVE file, and t… |
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Post #AcoOoZTHTp2FeA4IAC by [email protected] |
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so I've connected Chișinău, Moldova to Vinnytsia, Ukraine.or Kisinev to V… |
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Post #AcoOoc87awtNtPBw6C by [email protected] |
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and now I'm connecting Knoxville, Tennessee to Lexington, Kentucky.TIME FOR… |
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Post #AcoOoctGlebeFdFaaW by [email protected] |
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So, it turns out stations remember what city they're connected to, even whe… |
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Post #AcoOodePwMJubrJF4q by [email protected] |
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Belgrade is in Maryland now. That seems normal.I think it's because there&#… |
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Post #AcoOoePZ742Ay5MtZA by [email protected] |
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(notice that this is clearly eastern america but my current is in pounds) |
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Post #AcoOofAMJ5SrJDGGVE by [email protected] |
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uhhh. I think this one is my fault |
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Post #AcoQZu84al2BHTHZlg by [email protected] |
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found it: the byte at 0x38E4.00: Eastern US01: Western US02: England03: Europe |
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Post #AcoR1sdvi8pSmPWVA8 by [email protected] |
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@foone True, there aren't any mermaids in the Atlantic.Not since The Incide… |
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Post #AcoR1siBSKEQzbVtnE by [email protected] |
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@kawa ahh, yes. Project Azorian. |
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Post #AcoVfjCMe29ct6szTs by [email protected] |
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@foone Did the terminal driver explode? |
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Post #AcoVfjGcODYb6IsO6y by [email protected] |
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@mos_8502 I think the video card is in a text mode, but the game thinks it'… |
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Post #AcoVoyTBEh4WrCA0kC by [email protected] |
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@foone new pride flag dropped |
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Post #AcoVoyXQysTV4O9PNI by [email protected] |
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@lilbatscholar don't even joke about that. I'm always on the hunt for m… |
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Post #AcogoG5FMSCEgxpKoy by [email protected] |
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@foone but how do you convert pounds to ampers? |
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Post #AcogoG997xJct3eRto by [email protected] |
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@nikiel carefully |
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Post #AcomYkAmK1F76UOpyC by [email protected] |
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ahh, I figured out why my old hacking attempted died out: I don't know how … |
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Post #Acomj6bvkkQXac2aQK by [email protected] |
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but I have a workaround where I use a hacked version of the EXE which renders a… |
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Post #Acomj9pVmi4bZbPyVc by [email protected] |
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which wouldn't be a problem, it looks fine, except the MAP variant of the P… |
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Post #AcomyGfedFwB8N0pjU by [email protected] |
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so like, here on my test map we've got a lumber mill and a coal mine |
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Post #AconD5mrNckriqS43M by [email protected] |
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but on the MAP file, both of those end up as that purple color |
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Post #AconD8VxEw0yBHZ6cS by [email protected] |
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so I need to figure out on my own how to decode the PIC/MAP files.which is a pr… |
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Post #AconxdAhab2iaEnLFo by [email protected] |
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and you'd think they'd skip out on compressing saved games, but NOPE! t… |
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Post #Aconxfo7mzlWl5Fqym by [email protected] |
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I think it's some kind of LZ* compression, given how it seems back-referenc… |
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Post #AconxgYZ0Kud56ywMa by [email protected] |
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it's also possible this is a wild goose chase and the different industry bl… |
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Post #AconxhJ0Dg3jP8i1kO by [email protected] |
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nope. it's definitely in the map. I did the SVE/MAP switcheroo and it stil… |
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Post #Acooy1NtfNtZdGiUpk by [email protected] |
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back to the decompilation mines |
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Post #Acoq04LNjaNlLP53j6 by [email protected] |
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oh goody function pointers, my favorite |
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Post #Acoq9jiTHXlcGTUSNU by [email protected] |
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oh yeah they interleaved the write-file and read-file functions by misusing JMP |
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Post #AcoqykFn2lDwhTOiJ6 by [email protected] |
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because to have fread() and fwrite() as separate functions would waste somethin… |
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Post #AcoswhMd14J94DkRCC by [email protected] |
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so it opens the file, sets a pointer to a function, then calls another function… |
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Post #Acotr14ytz4qQiLeV6 by [email protected] |
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oh god I think I found the compression functions but it seems it involves abusi… |
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Post #Acotr4APQGCY0PuWsS by [email protected] |
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and it's not a normal decompression function where there's a in-buffer … |
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Post #AcoxevPEZLn5AyJLfM by [email protected] |
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I got distracted and extracted the text out of an apple II game about sex.this … |
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Post #Acoyzadz3bm4opczgW by [email protected] |
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"JMP BP"yeah, this assembly was written by a human.emphasis on ASSemb… |
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Post #Acoz5fEUuOOWmxbSng by [email protected] |
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WHY WOULD YOU JUMP TO THE FRAME POINTER? |
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Post #AcozoahsaDhBmZlkki by [email protected] |
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it's at the start of the function, too.like, you just called a function, wh… |
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Post #Acp0bCMTt1ReT0wDqa by [email protected] |
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@foone I'm not sure if this is better or worse than jumping to VRAM, which … |
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Post #Acp0bCR5bt8ChJ5u1w by [email protected] |
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@endrift there's one SNES game that jumps to the DMA registers.not DMA'… |
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Post #Acp1wahqfWSc0QhHvc by [email protected] |
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@foone @endrift Was that Another World by @burgerbecky ? |
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Post #Acp1wam6PhraDcggYi by [email protected] |
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@gentarkin @endrift @burgerbecky YUP! |
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Post #Acp26AIBjIsYyrGBOq by [email protected] |
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I set a breakpoint at the address 1000:0AD6it hit at 093D:7D0Abug in DOSBox?No!… |
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Post #Acp3ItgUtAAhBtGW0m by [email protected] |
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@foone every address has... 256 addresses? have I done my math right? |
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Post #Acp3ItkOefI5Nz5d5c by [email protected] |
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@alilly I think it's 4096? because a segment is 65536 bytes, and you can se… |
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Post #Acp4d8713YWhgQsg7s by [email protected] |
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I'm afraid, Dave. Dave, my mind is going. I can feel it. I can feel it. My … |
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Post #Acp5at504lMOR5Qsro by [email protected] |
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the whole thing about call BP makes even less sense when you follow up the call… |
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Post #Acp97mmUoWnsJv9kI4 by [email protected] |
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oh okay, I think the (de)compression routine is line based.I found that the &q… |
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Post #Acp9GUUQBtCiCEqw5Y by [email protected] |
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A fun thing about the saved maps is that they're 320x200.The game maps are … |
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Post #AcpAFW7uidaQwDQOMC by [email protected] |
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ahh, 0x2E96, a hex number that makes floating point calculators confused |
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Post #AcpAYeNAHiUE0xgJmq by [email protected] |
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naturally in the middle of the "decompress the saved-game map" functi… |
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Post #AcpAqhG6IEj4B5yydE by [email protected] |
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but yeah it happens because they have the graphics code implemented in separate… |
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Post #AcpBGamB1B2xbMKkxU by [email protected] |
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wait the code is loading a 320x200 pixel bitmap and immediately drawing it into… |
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Post #AcpBXh7QglseCEQhFY by [email protected] |
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I don't understand. It's loading the map file and writing it right out … |
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Post #AcpCaQMPYJJp2nIpFI by [email protected] |
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railswhy is there an EXE header at offset 0x17400 in your binary? |
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Post #AcpCvbEKKo0upwcPR2 by [email protected] |
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and 0x15800and 0x16600and 0x18600and 0x19000and 0x19800and 0x1A000and 0x1AC00an… |
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Post #AcpDG63HRvNqDkE2Ay by [email protected] |
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this file has INTERNAL OVERLAYS?! |
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Post #AcpDoHNPqnYxBowXFg by [email protected] |
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@fooneyou mean a dos header pointing to a coff header? |
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Post #AcpDoHRJcIgLNuleKW by [email protected] |
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@tthbaltazar no, a dos header, and then many more DOS headers |
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Post #AcpE7YplAZHcpmOXq4 by [email protected] |
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I thought the UNP extraction stuff had removed those and merged it all together… |
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Post #AcpE7c90rRSz6MQSlU by [email protected] |
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in other words, TIME FOR GO TO BED |
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Post #AcpE7curzVkPUmogMK by [email protected] |
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at least I know where the decompression functions are. I can extract those and … |
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Post #AcpF7URPbLT5AGXK0u by [email protected] |
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@foone So maybe it's a way to reduce the number of files?I have vague recol… |
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Post #AcpF7UVfLWs3NSWie0 by [email protected] |
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@pare I don't think so, this game has a ton of files already with no attemp… |
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Post #AcqQmtuj5lvIh59mIy by [email protected] |
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@smammy which is impressive, because this game takes place at the height of rob… |
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Post #AcqRLugcDDbdE0FfDk by [email protected] |
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@foone railroad tycoon. Recently covered this on my amiga cracking stream. Easy… |
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Post #AcqRLulDw5IBSIPLP6 by [email protected] |
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@h0ffman neat! hopefully that's not the case here, because just about every… |
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Post #AcqULi17cFOhnJRBvE by [email protected] |
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okay manually stepping through the decompression confirms my theory that the de… |
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Post #AcqUVAMfacpCJq1frk by [email protected] |
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So far, I've got this:00 01 Ocean02 Clear03 Forest04 05 Coal Mine06 07 Foot… |
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Post #AcqUt4Q7LIA2ph2Lzc by [email protected] |
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okay I've made a key discovery that makes some of the weirdness make more s… |
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Post #AcqV1b6Dj5ZGVAnQvI by [email protected] |
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I found this out by modifying it while it is being loaded: the changes appear o… |
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Post #AcqVn2uE9y3kLvoOgK by [email protected] |
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well I stepped through all the invocations of this function (which I have insig… |
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Post #AcqW1L81CpXKvH4vBY by [email protected] |
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so it loads the MAP filethen faces.picsprites.pictrack.piclocos1.pic...and noth… |
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Post #AcqWKqrBSr20pSVYw4 by [email protected] |
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so from selecting save, it calls int 21,AH=3D with:RR0.SVERR0.MAPits own EXE (o… |
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Post #AcqXRByRxpOY0xUh0K by [email protected] |
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but wait, if it's smuggling out the map data, why don't my changes get … |
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Post #AcqXcgOdC9OZYLDefA by [email protected] |
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if so, there's only one place it could do that... and it's in an overla… |
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Post #AcqXvDyr4I5QvQ0J96 by [email protected] |
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and that overlay is NEVER CALLED! |
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Post #AcqZ0nTAeGMoOVPATg by [email protected] |
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please, PLEASE tell me they don't save the map inside the graphics overlay(… |
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Post #AcqZXtwXbH7g1ovb96 by [email protected] |
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this function is DOUBLE THUNKED?! |
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Post #AcqZzR1WiSNeRbOBPM by [email protected] |
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whelp, I dug into the EGRAPHICS.EXE file and found what was getting called, and… |
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Post #AcqaHlnKEFbe4oUOcy by [email protected] |
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EGRAPHICS.EXE is amusing. The entry pointer leads to a function at 1000:0010, w… |
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Post #AcqaWY5lSOcvvGA3Xc by [email protected] |
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which doesn't make a lot of sense, honestly.that's because it's not… |
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Post #AcqaWb8M9DTzMAOfUu by [email protected] |
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to which all I can say is:INC SIPUSH BPINC BXDEC BXPOP DIPOP C… |
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Post #Acqbf1PgQPXl8E59eq by [email protected] |
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@BetaRays yeah I didn't bother roundtripping it so it probably doesn't … |
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Post #AcqcwI1s05tzXfk2Pg by [email protected] |
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@foone Just removing the E prefix from each register seems to work. |
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Post #AcqcwI67kHIxkrjR2m by [email protected] |
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@BetaRays thanks. fixed. |
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Post #AcqdDUSJ3KRn0MJCcK by [email protected] |
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okay, time to take another approach: I'm gonna go into debug mode, then cap… |
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Post #AcqdX6tINKYtiCHvVY by [email protected] |
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this'll obviously fail if they store it in a modified form, however |
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Post #AcqdX9up86ZD5o1go4 by [email protected] |
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or worse, they never store it uncompressed at all.maybe they just re-decompress… |
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Post #AcqdXAfcK7ztQvv3k8 by [email protected] |
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this game WILL run on an original IBM PC (if upgraded to 512kb of ram)maybe the… |
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Post #AcqdXBQlUpi9n9yiES by [email protected] |
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unrelated note, I should hack the amiga version tooit looks like they went all-… |
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Post #AcqeJKFzz1jZ4AtlNA by [email protected] |
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interestingly, Railroad Tycoon Deluxe seems to use basically the same save/map … |
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Post #AcqepyKEXtkMbQRiyW by [email protected] |
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See? Uncompressed. |
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Post #AcqkZ8OATanCcFdnFY by [email protected] |
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if I can figure out the compression method I may be able to re-inject the Delux… |
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Post #AcqlfHvE2qelsGbLqy by [email protected] |
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it's not a question anyone has asked, but now you know:you can't copy t… |
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Post #AcqlzdDwYRtRjU3bbE by [email protected] |
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and it seems that railroad tycoon and railroad tycoon deluxe cannot read each o… |
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Post #AcqmMCNuVa7x9WTorg by [email protected] |
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@foone what's the end goal? Extracting assets, or full recompilation? |
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Post #AcqmMCSAFlWvMiTDUm by [email protected] |
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@viraptor just the usual, wanting to look inside games I spent a lot of time wi… |
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Post #AcqmYlfv7oOy4xthaa by [email protected] |
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okay it definitely doesn't store the maps in memory as-decoded. I did a sea… |
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Post #Acqn1De8ip7CwGdBia by [email protected] |
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@foone oh, I guess I need new Friday night plans. |
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Post #Acqn1Di2UKEb8MSInQ by [email protected] |
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@mima I know, right? it ruins all my plans! |
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Post #AcqpOyIFehueBFqYy0 by [email protected] |
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I realized my plan to try and VM-hax the decompression routine won't really… |
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Post #AcqpUkNyHFCmmfHBaK by [email protected] |
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so realistically to VM-hax the decompression routine, I'd need to stuff not… |
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Post #AcqpbArUkhJ2dU9NrM by [email protected] |
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so what if I attack it in a completely different way?I've got it running in… |
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Post #AcqqMeUaP8Fq8y4esi by [email protected] |
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or I could actually figure out the compression algorithm.like an adult.but I do… |
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Post #AcqszjAJAEoTq3LjX6 by [email protected] |
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okay so I have extracted some data. I have a 48-byte file that I know extracts … |
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Post #AcquozuWlS8MUqynTM by [email protected] |
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20 61 in the input results in a 01 written to the output.how.why? we may never … |
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Post #AcqvDvDPMKFTAohBtw by [email protected] |
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OH GOD I DESTROYED THE WEST COAST AGAIN |
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Post #AcqvVmfLsrMRs3HdeC by [email protected] |
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and now the area around Vancouver is a desert that looks like a swamp |
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Post #AcqwCy915CiTvGkd2u by [email protected] |
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@foone Foone I believe that's the east coast |
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Post #AcqwCyCuqhps7MZk7k by [email protected] |
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@SteveSyfuhs it is now, but it wasn't when I started! |
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Post #AcqwWNB4Ec9t3zxklE by [email protected] |
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So, this decompression function:3+1 functions interleaved. (The +1 is for the e… |
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Post #Acqwcdweo2linxDEo4 by [email protected] |
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of the 13 global variables, I currently understand one of them, and maybe half … |
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Post #Acqwlkxa5uDlAQzSBk by [email protected] |
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if that wasn't bad enough, the middle of the three functions DOES NOT HAVE … |
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Post #AcqwyqItXO9TVOCQVM by [email protected] |
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it's possible this code doesn't make sense because it's not all the… |
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Post #AcqzAsiMbFrMMiyr8S by [email protected] |
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I have figured out TWO global variables now.one of them specifies if we're … |
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Post #AcqzppIcCctPe7Se0G by [email protected] |
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so the for loop inside the internal decompress, it starts at 8, compares it is … |
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Post #Acr1z0VC7U7UuDqmTA by [email protected] |
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I think I'm up to three |
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Post #Acr26GWqvmpQdg5SWu by [email protected] |
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but I also found a table that's 768 bytes long. so I'm also kinda down … |
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Post #Acr2P2JdzztK3mrLXs by [email protected] |
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and experimentally that weird stack-jump only goes to two locations in the call… |
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Post #Acr3ROy0qyyEqQQvQ0 by [email protected] |
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I've run out of brains for today. But I will continue |
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Post #AcsWwcKSJd575l7yVs by [email protected] |
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so I think this compression format is specialized to writing nibbles. like, I t… |
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Post #AcsXQwAX7ECvJOwb3Y by [email protected] |
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it might actually be 0x0N0N? but again, it doesn't seem to be possible to t… |
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Post #AcsYnpdDgfKveRqJxQ by [email protected] |
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god this is terrible.so there's like three ways things can get pushed onto … |
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Post #AcsYyUlDcpUQ6ffXhA by [email protected] |
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I can't easily tell WHEN they get saved because, of course, ghidra can'… |
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Post #AcsZ9dTNZcneJRdYK8 by [email protected] |
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and the dictionary makes no sense. it's 768 bytes long, and it's format… |
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Post #AcsZ9ggxbaRiIR0wPQ by [email protected] |
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okay great. but then there's code that searches it to find a "slot&quo… |
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Post #AcsZQXHZqI3w2KAvQW by [email protected] |
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except I step through the decompression of the first line of code and THE DICTI… |
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Post #AcsZZZy9DsrCyWOpWq by [email protected] |
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I think I need to officially stop looking at the decompilation for this code. i… |
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Post #AcsZs1KgE1213OjSq0 by [email protected] |
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REVERSE ENGINEERING COMPRESSION CODE IS THE WORST |
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Post #Acsa1UZsrSyiMXMOX2 by [email protected] |
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this is actually decompression code, to be accurate.and I know there IS compres… |
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Post #AcsaRlvUyxBvhJ09su by [email protected] |
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I hope I'm misunderstanding this code, because if I'm not, they fucked … |
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Post #AcsbTanVQiyhiOh9IO by [email protected] |
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the programmers of this code don't seem to believe in passing arguments bet… |
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Post #AcsbdWoB7HX4ErkNrk by [email protected] |
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or they pass width/height of a bitmap into fopen() and then fopen() does nothin… |
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Post #AcsbdZWD2XwQe0MZm4 by [email protected] |
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<Garth Marenghi> I KNOW PROGRAMMERS WHO USE PURE FUNCTIONS AND THEY'R… |
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Post #Acsbwu6SjMlrzMXRbc by [email protected] |
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they're also checking the return code of this function after calling it, bu… |
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Post #Acsc6cg4NEx2q7pNgW by [email protected] |
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@[email protected] wh.. what do they do instead, global variables? |
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Post #Acsc6ckK7QM13JomJc by [email protected] |
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@sekoiatree yes! some of which are reused for different purposes in different s… |
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Post #Acse14dVi8a3it72Ia by [email protected] |
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@foone I reverse engineered an LZSS-based compression format in a GBA game in 2… |
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Post #Acse14hPTdhRuyw9NQ by [email protected] |
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@endrift how much caffeine and adderall did it take? |
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Post #Acse8dAfi3BSrGE7xg by [email protected] |
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@foone Have you written more software than you’ve used? |
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Post #Acse8dEvSEaR4SDWam by [email protected] |
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@michaelgemar that would be hard to do! |
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Post #AcseME7ddaeZDyI6ls by [email protected] |
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THE SAVE GAME FUNCTION THUNKS INTO THE VIDEO DRIVER OVERLAY!? |
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Post #AcseMGllnLwXR15BbM by [email protected] |
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I need to go find my copy of Sid Meier's autobiography. maybe there's a… |
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Post #AcseMHWYzNNDm8yYXQ by [email protected] |
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oh sweet lord jesus it's reading from the video ram |
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Post #AcsexXLn6tJnZfhZSK by [email protected] |
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@foone The sample code for the API I'm using just puts parameters into envi… |
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Post #AcsexXQ2r4ilmrgy5Q by [email protected] |
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@aburka AHHHHHHHHHHHHHHHH |
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Post #AcsfF27nwdonwUVDn6 by [email protected] |
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WHY WOULD YOU STORE YOUR MAP IN THE VIDEO RAM YOU FUCKING WEIRDO |
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Post #AcsfN6VVXFrzqnRD9c by [email protected] |
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dosbox-x needs a "dump vram" option |
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Post #AcsfY3IXo5wz5DawiW by [email protected] |
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any the weird thing is that I don't think the map is IN vram when it goes t… |
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Post #AcsfhAyad4IPVEc0C8 by [email protected] |
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but I found the compression code. it's... simpler? slightly? at least it se… |
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Post #AcshsTPubi9bmzuGKO by [email protected] |
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AHH THE SAVE GAME FUNCTION IS CALLED FROM ANOTHER OVERLAYif it's the fuckin… |
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Post #Acsjn7thOAmrVYPv1c by [email protected] |
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thank fuck, it's not, it's one of the other internal overlays.the ones … |
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Post #AcsjnAb1M4d3sUhXpQ by [email protected] |
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minor breakthrough:the save_game_map function repeatedly calls compress_map(N,M… |
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Post #AcsjnBNESpC4I1G2yW by [email protected] |
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now, compress_map does the following:first, it checks for the tile being 0x90. … |
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Post #AcsjnC9RZZl4hXoY7c by [email protected] |
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and if the repeat count is less than (or equal to 3), it just calls inner_compr… |
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Post #AcsjnCw0f0bf8AXKoy by [email protected] |
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which kinda seems like it'd write a file like this:all bytes are written as… |
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Post #AcsjnDhrn4t5WavYPo by [email protected] |
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very simple RLE, right?except that's absolutely not what the file ends up l… |
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Post #AcsjnETiv9AVv1Jm0e by [email protected] |
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because that's the thing with this format: as is, it'd make pretty bad … |
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Post #AcsjnFGdzGIgMkCqGG by [email protected] |
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so I think they added another layer of indirection, doing something like encodi… |
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Post #AcsjnG2V7Ka6lAb3r6 by [email protected] |
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okay so, the first level of encoding is RLE.The map is RLE'd into the follo… |
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Post #AcsjnGp4ClQhBnJqYS by [email protected] |
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that gets turned into a stream of bytes passed into inner_compress, where bytes… |
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Post #AcslcxbJ15oYaO5tFg by [email protected] |
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@foone None, I avoided coffee until 2015 and I wasn't about to take other s… |
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Post #AcslcxfYlHDWna5Hsm by [email protected] |
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@endrift dear godare you sure you're human and not some kind of robot made … |
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Post #AcsnntxZ5sYCO4qnRI by [email protected] |
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@foone I believe that in one episode Garth said he had written more books than … |
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Post #Acsnnu1SrNfaaAfuW8 by [email protected] |
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@michaelgemar oh right, I forgot the reference! |
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Post #Acso3JExNquH8ZKfdQ by [email protected] |
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@foone it’s hillarious that nearly all the things you find astounding in this… |
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Post #Acso3JJZ6iapMrULom by [email protected] |
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@foone i guess after a while one has “seen it all” |
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Post #Acso3JNSsDiDYxJStc by [email protected] |
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@clairely_undaunted I think it just means that you too have been slightly damag… |
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Post #AcsoTpx6Nr3S7Yd8gi by [email protected] |
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now the final transformation is the one I don't understand, but I can cheat… |
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Post #AcsoTt9GV5ZC29LOYy by [email protected] |
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so yeah. Compression is a 3 step process:Map -> RLE tuples -> RLE Bytestr… |
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Post #AcsoTtwBZChMTsESoa by [email protected] |
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so we've got a function that should write 3 16-bit words to memory. where d… |
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Post #AcsoTujSc076whHocS by [email protected] |
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well I can at least put aside the brainhurty figuring out stuff for some bookke… |
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Post #Acsp2O3C76fPijxFZI by [email protected] |
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@foone I once printed out a bunch of code just so I could set fire to it in a p… |
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Post #Acsp2O7RrI4NvvweCO by [email protected] |
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@sungo that's a good idea. where's my dot matrix printer? |
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Post #AcspsmcxyxBb0FfgGG by [email protected] |
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@foone this may be the right moment to note that much of what we call "the… |
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Post #AcspsmhDj8aZDRf4tM by [email protected] |
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@SvenGeier as MST3K said, "It's the Eighties. Do a lot of coke and vot… |
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Post #AcsqATRC4IaShPbGiG by [email protected] |
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I've Trantored/Coruscanted the west coast! it's all cities, all the tim… |
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Post #AcsqAWClmNpdHXsI9A by [email protected] |
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well, mostly. some tiles didn't get changed to cities (I'm not sure why… |
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Post #AcsqgMg6jeDR0Amaw4 by [email protected] |
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ugh I keep crashing this game that I'm hacking the code of at runtimewho co… |
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Post #AcsqtJC508KBxZuS7E by [email protected] |
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okay finally got it working. Here we go. From Alabama to the Pacific ocean (and… |
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Post #Acsr6Ka59g1u1iLW4G by [email protected] |
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And here's what happens when you zoom in: It's not ACTUALLY all city, e… |
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Post #AcsrJ5zGj3AuWtDIe0 by [email protected] |
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@Nekoplanet Nah, it came out on PC first. There were ports, but they were all t… |
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Post #AcsrTWsvZjXSqaDs5Q by [email protected] |
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now here's the question: does the industry pattern break at the bottom of t… |
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Post #AcsrkHf1QqlsYKhwA4 by [email protected] |
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it's discontinuous! so yeah, it uses tile numbers. |
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Post #AcstEtRlblxqO0fQgq by [email protected] |
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so it turns out it uses the positional thing for more than just cities.tile_typ… |
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Post #AcstSkgKzd1RFx5hA0 by [email protected] |
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here's the really weird part. This map, despite looking like that, is actua… |
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Post #AcstrfqM7S31UQf0m8 by [email protected] |
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here's the 0A ("farm") tile: it turns out it's a mix of farms… |
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Post #Acsu6ONXKqU3fRCO6y by [email protected] |
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@foone i just know how the sausage was/is made, i look forward to blissful igno… |
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Post #Acsu6OS93iAbtjM4IK by [email protected] |
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@clairely_undaunted I'm sure that's completely unrelated to the instanc… |
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Post #AcsuCQlDONeGnB9ZwW by [email protected] |
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0b (foothills) are not special. set it to all 0b, and you really get all 0b |
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Post #AcsuMO1WQIIrCQWoWO by [email protected] |
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villages are also paper mills, stock yards, factories, and food proc. |
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Post #AcsudgXUpqqLY1jUBs by [email protected] |
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@foone absofuckinglutely though tbh it’s just a different type of programming |
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Post #AcsudgbObLxjk7YbGi by [email protected] |
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@clairely_undaunted heh. makes me think of a security engineer who is really in… |
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Post #AcsutjMa6UK8wJHJom by [email protected] |
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okay checked the rest (except rivers, because... no)so 05 and 08 are mines, 0a … |
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Post #AcsviJZnjoFrjRa9oG by [email protected] |
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judging by how this worksI think it might be writing data files in 47-bit chunk… |
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Post #AcsvqUyTFEErOm1W9Q by [email protected] |
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so, a datapoint:a map entirely full of 01 and a map entirely full of 02 are dif… |
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Post #AcsvqY61db4354a5qK by [email protected] |
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it's possible the intermediate RLE is making this weirder than it should be… |
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Post #AcuW2JwxqjFQBrDPns by [email protected] |
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so I need to write 256 bytes into RAM, without a pointer to it, in... 5 bytes.o… |
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Post #AcuWF353sfXDdS4WSu by [email protected] |
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okay maybe I can take out a function callthat gives me like, 45 bytes. more tha… |
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Post #AcuWotcuVYssjszviS by [email protected] |
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MOV AL, 01MOV DI, [BP-6]MOV CX, 320REP STOSBthat's 10 bytes. |
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Post #AcuXiXnqpnZ7GseNkW by [email protected] |
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well my code was supposed to generate a world that's entirely water, but I … |
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Post #AcuXqnwkhGuHekkihs by [email protected] |
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@foone Mind the direction flag |
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Post #AcuXqo0eSm1fqqZpmi by [email protected] |
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@Computeum good point. I'll stick a CLD in there |
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Post #AcuZEdwlcx9rXxgsbo by [email protected] |
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oh I'm a doofus.I was trying to hack the game to save a game where every ti… |
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Post #AcuZWAXrgG7BZVOqCu by [email protected] |
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and done.I was so busy trying to use my HACKER SKILLS to realize I didn't n… |
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Post #AcuZic1zJZKEICQHhY by [email protected] |
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okay so a map of all the same tile results in an 83 byte file, which only varie… |
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Post #AcuZif73rAALqnosWe by [email protected] |
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now the reason it's not smaller is that a map actually looks like this:It&#… |
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Post #AcuaPiAuLc7Fnd98ZU by [email protected] |
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NOPE! I decoded (using my load-it-as-a-logo trick) the all-1 and all-2 tiles an… |
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Post #AcuaPiFW4Tno1vIokq by [email protected] |
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so what the heck |
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Post #AcuahPZIGWRNIvzbNo by [email protected] |
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well I interestingly corrupted it |
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Post #Acub2neRv6S04ubRVw by [email protected] |
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yeah I'm randomly corrupting it, and this isn't any RLE. This is defini… |
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Post #Acub2qIw3Y1YJ3Yntg by [email protected] |
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who wants to play Railroad Tycoon on Memory Uninitialized World? |
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Post #AcubXw1uopzf2aQR2e by [email protected] |
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fun fact: because the saved game map files are the same format as PIC, you can … |
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Post #AcueyxlykLCy7yYCvo by [email protected] |
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@foone What does the zoomed-out version look like? |
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Post #AcueyxpsVqKMK4NK0e by [email protected] |
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@jtlg that's the left image! |
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Post #AcujpFbm4zXGJmxwqu by [email protected] |
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@foone For a worrying moment I thought this was Railroad Tycoon over SSTV |
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Post #AcujpFg1pAwEWyxLU0 by [email protected] |
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@tryst I'll have to do that next. Most of my TV stuff is analog ntsc but I&… |
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Post #AcwYQUVCr9S85lnwx6 by [email protected] |
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god help me I don't want to have to write an extension to link ghidra and d… |
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Post #AcwZIbQFLNy3BwHrVo by [email protected] |
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I might just write my own debugger. the dosbox one is slightly terrible. |
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Post #AcwZdpkdGUDbiFwizg by [email protected] |
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basically I need to watch the input buffer, the output buffer, about 15 random … |
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Post #AcwcoO5Cm5NmwvIDtw by [email protected] |
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@foone that first picture looks like what I call Rainbow Death Snow when it app… |
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Post #AcwdoZyodrRJnjxZI0 by [email protected] |
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it's kinda telling about how my brain works that I keep running into revers… |
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Post #Acwf9E7VDAym2VQrDc by [email protected] |
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@foone An idea I've been mulling for a while is to hack up a copy of MAME/M… |
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Post #Acwf9EBkxMNkFhQFqi by [email protected] |
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@curtmack yeah, something like that would be awesome |
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Post #AcwfK92cR0KnTPM168 by [email protected] |
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@foone but what if you wrote a generic, retargetable, debugger construction kit? |
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Post #AcwfK96sBBjlgbLPjE by [email protected] |
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@StompyRobot yes why not? why not turn a simple "hack one game" proje… |
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Post #Acwfry87VbjfTj3WJE by [email protected] |
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@foone Obviously this would slow down emulation, but I think it would still be … |
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Post #AcwfryCNFn8dgv2uwK by [email protected] |
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@curtmack yeah. and even if slow, you could have it be togglable: you turn it o… |
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Post #Ad0vlHHkGdl2l8EFyC by [email protected] |
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I think I'm gonna try abusing external memory reading into letting me watch… |
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Post #Ad0vuh3lo7a7IuBLGa by [email protected] |
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that's one of the problems with being a game hacker: you don't use &quo… |
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Post #Ad13rNjQ0onM7gav20 by [email protected] |
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here's why I hate reversing compression code:there's no shortcuts. |
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Post #Ad144eRTC6RxiLWhoe by [email protected] |
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I am a fucking MASTER at finding shortcuts. I have endless tools and tricks and… |
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Post #Ad144hD2uBh8ITnjFY by [email protected] |
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compression is the ultimate "you stare at this code until you understand i… |
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Post #Ad14SlVkYzB0aY1jXs by [email protected] |
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and I have EXACTLY the wrong kind of brain to be any good at that. my brain is … |
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Post #Ad14SoCiYCjcwO94nQ by [email protected] |
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I do not have a smart brain, I have a clever brain. they are not the same. and … |
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Post #Ad15BYuEH9noWdpzkG by [email protected] |
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@Sweetshark exactly |
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Post #Ad15HlPMhosH2PMHaa by [email protected] |
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this debugger needs a "step backwards" command |
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Post #Ad18nsnj3QUT5zlBWS by [email protected] |
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@foone you know about debuggers that do have such a command then, yes |
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Post #Ad18nssKmIB1KHurho by [email protected] |
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@thorsummoner yes. dosbox-x doesn't have it, though |
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Post #Ad19aC1msAJacuNCka by [email protected] |
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ahh I've hit another function where ghidra has decided it can no longer ren… |
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Post #Ad1EcETLFrPWYe3Nb6 by [email protected] |
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it's physically impossible to stare at x86 code for long without wanting to… |
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Post #Ad1FUUD0xjBF0AHqBk by [email protected] |
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@secretasianman I've not done much work in those architectures, so I don… |
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Post #Ad1GDDQiC2nxzf1R1k by [email protected] |
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although it's amusing when you see code like:MOV BX, AXADD BX, AXADD BX, AX… |
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Post #Ad1GMOIDAt5yI4QBH6 by [email protected] |
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it probably does but this code is targeting 8086 so it couldn't use it yet |
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Post #Ad1WMe83tV5GfkokZU by [email protected] |
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maybe I just need to write an x86 emulatorlike you do |
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Post #Ad1WSdWh32EEXaC9yK by [email protected] |
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I haven't written an x86 emulator since... oh yeah the last time I tried to… |
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Post #Ad1Wn5cuHWcdU2r1hQ by [email protected] |
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@foone time for a DAYS SINCE FOONE WROTE AN X86 EMULATOR counter. |
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Post #Ad1Wn5hA1i1bhEqQKW by [email protected] |
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@alys it was at 3227 days! I was out, but they pulled me back in |
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Post #Ad1XzkO4eyEDKWW2kK by [email protected] |
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I've gotten weirder and I tried dumping a compressed map into a bitmap rend… |
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Post #Ad1YDh6berDvCpzo6y by [email protected] |
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okay it only appears in my super-compressed files. not in the semi-compressed o… |
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Post #Ad1aJIf9eG7D2mxM00 by [email protected] |
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okay so I've done an interesting experiment: I turned off the RLE.So the fu… |
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Post #Ad1aVTdUfyOWYGzBjM by [email protected] |
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and there's again an interesting pattern at 9-bits wide. |
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Post #Ad1d7rwOxVkSqRGRzU by [email protected] |
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made a BIG discovery:the labs.PIC file in railroad tycoon is identical to the o… |
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Post #Ad1dHrKE6RbZpaAiZ6 by [email protected] |
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and you know WHY that's a big deal? THERE'S TOOLS THAT CAN EXTRACT COVE… |
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Post #Ad1dHuDFMqnwmnvgbQ by [email protected] |
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https://github.com/jarikomppa/covert_action |
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Post #Ad1dTyv3h6IYrIBEjw by [email protected] |
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it's LZW! the same one that powers GIF |
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Post #Ad1deyiCnzFXOvPbOK by [email protected] |
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SID MEIER'S RAILROAD TYCOON VIOLATED THE UNISYS GIF PATENT |
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Post #Ad1e1ohSCE0j0dwzoG by [email protected] |
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well it's not decoding it exactly right, but it's... close? |
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Post #Ad1h6y5J1zkNQTFsoq by [email protected] |
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And it works. We have decoding of Railroad Tycoon MAP files! |
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Post #Ad1hF2Md0Kh70zCmEi by [email protected] |
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this thread has been going for a week and I finally got the result I needed and… |
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Post #Ad1hF5UBOhWIhHlLvc by [email protected] |
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(okay not really. I had to modify the code, and the modifications were only pos… |
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Post #Ad1hYFAlbdsUF5ocbI by [email protected] |
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@foone I always dreamed of having a public hash database, where you put the has… |
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Post #Ad1hYFEfN8zsRBdjg8 by [email protected] |
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@andrea yeah! I've thought about doing something like that for DOS games, p… |
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Post #Ad1hhmvJUVGxWb8dhg by [email protected] |
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so I need to do some stuff to modify this to not write PNG files but instead wr… |
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Post #Ad1hhpbDXfypp8l8IS by [email protected] |
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as well as put this code online and make a pull request.but all that can wait. … |
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Post #Ad1i7eQxg43wixH35M by [email protected] |
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time to close every tab and program I have open.it's over. I won. all that&… |
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Post #Ad1l3Kh3Qho6CjQx0K by [email protected] |
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@foone it's over? I honestly expected to see a trans flag as a map tomorrow… |
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Post #Ad1l3Klf9ZUeR1adBg by [email protected] |
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@viraptor sigh.I'LL DO IT TOMORROWassuming I can. I have limited colors her… |
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Post #Ad1lANFALY9m8mkLho by [email protected] |
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@viraptor what do you want me to do, remap the palette used by the game?actuall… |
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Post #Ad1ujxRidbIo8xf1fc by [email protected] |
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@foone not an expert, but PPM might be the right image format for you: it's… |
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Post #Ad1ujxVyNmhmM9eQIi by [email protected] |
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@andrea the image format isn't the problem, it's just that I don't … |
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Post #Ad3AjlLzOEW542ryBk by [email protected] |
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@foone Is this how Xorg got its x86 emulator to run vbioses :blobcatthink: |
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Post #Ad3AjlPt9jdTG8h5Ga by [email protected] |
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@NanoSector ahh, x86. the lingua franca of computers |
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Post #Ad3ReYD6Wl7u4doXZY by [email protected] |
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@dpflug I sure did! I'll never learn! |
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Post #Ad7ES7dKzZofOsfRwm by [email protected] |
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bah. dosbox doesn't let me set breakpoints on io ports. WHY NOT? |
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Post #Ad7G4sORgklJNikGXI by [email protected] |
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@JackEric I'VE BEEN BREAKING THINGS SINCE I WAS OLD ENOUGH TO HOLD A SCREWD… |
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Post #Ad7GjPcrYATW29olOq by [email protected] |
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ugh. so the palette-setup call is into an external overlay and called from an i… |
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Post #Ad7HpBBAH94ev5Aybw by [email protected] |
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I'm sure that's fine |
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Post #Ad7LKdWbEizLfitSnA by [email protected] |
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@Ephraim_Bane always! |
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Post #Ad7NUSWpAw6IN5oIYS by [email protected] |
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so the EGA/VGA driver handles colors in a weird way: The main EXE passes a list… |
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Post #Ad7NVcBMlfiWbOKB6W by [email protected] |
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@ironiridis I'll fix that before I'm done |
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Post #Ad7NmzFsEmG15FiU9g by [email protected] |
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that list, btw, is the following:00 01 02 03 04 00 06 07 08 09 0A 0B 0C 0D 0E 0… |
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Post #Ad7O6Sk4pSay2S89J2 by [email protected] |
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this translation means the actual colors end up being:00 01 02 03 04 00 06 07 1… |
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Post #Ad7OF5Q2ufSaJFsCrQ by [email protected] |
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@foone does it really drop the 4th bit? |
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Post #Ad7OF5TwgAZyVLhJwG by [email protected] |
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@Flux yep |
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Post #Ad7OS5H2lRAbcjrOjI by [email protected] |
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Turning off the color-shifting logic makes the intro a bit uglier |
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Post #Ad7P6iCBTR1pv7xaNc by [email protected] |
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it's still not working. I think something deeply fucky is happening inside … |
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Post #Ad7R0GRlvftq1xIwVM by [email protected] |
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@foone can it do Hercules Graphics card mode … say, 640x350 with something r… |
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Post #Ad7R0GW1frIoF9IL8S by [email protected] |
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@HoustonDog I'm not sure. The game has separate graphics drivers for hercul… |
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Post #Ad7RUdXCee5cK5KMtc by [email protected] |
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I don't get it.I'm using the following:INP 0x3CA; Clear 3c0 indexOUTP 0… |
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Post #Ad7Rb9G9cAVASCSSPY by [email protected] |
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but instead of a pink color for index 1, I'm getting grey. AAAAAA grey. |
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Post #Ad7RobiL8Gb0T83k8G by [email protected] |
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it's in EGA/VGA video mode 0D: that's 320x200, 16 colors, 8 pages. I do… |
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Post #Ad7S5LV6fOlv6fqpcG by [email protected] |
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that grey color is color index 07: so it's acting like it's truncating … |
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Post #Ad7SNVA7U52AHegyES by [email protected] |
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ugh. maybe the mod register has the shift register turned off? that supposedly … |
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Post #Ad7TDToxiS9zBMa5Dc by [email protected] |
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ah-ha! I found a hint:EGA apparently only supports color remapping in 350-line … |
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Post #Ad7TpcnInn4e14zeTY by [email protected] |
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yeah that's fine |
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Post #Ad7U7Wp7ju4ciANmQC by [email protected] |
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there's my pink! it's just rendering completely incorrectly because I&#… |
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Post #Ad7UQRAF0NLaf3HC3E by [email protected] |
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so one way I could fix this is to stay in mode 0D (320x200x16) but use the VGA … |
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Post #Ad7UwsCvzfP1nl0Ewi by [email protected] |
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it helps if you don't have your DOSBox set to emulate an EGA card, I'm … |
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Post #Ad7V6M7GAEF7AQs0jg by [email protected] |
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THAT WAS THE WRONG INDEX OH GOD |
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Post #Ad7VCsfc2dltry39N2 by [email protected] |
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@foone I would listen to a podcast that is nothing but highly esoteric DOS era … |
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Post #Ad7VCskDlVSS6GCpYO by [email protected] |
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@shram86 god yeah |
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Post #Ad7VdQo1kSWjGie70a by [email protected] |
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but there we go. There's my pink. Just needed to use the VGA registers inst… |
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Post #Ad7Wi1vZlwwdVovwWW by [email protected] |
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there we go. Using my patches to pic2png/png2pic and modifying EGRAPHICS.EXE to… |
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Post #Ad7WqMPtTjnJNH5RQ0 by [email protected] |
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now I just need to write this onto a floppy disk (or two) so I can take it down… |
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Post #Ad7XktXXVvWIJycXS4 by [email protected] |
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I need to figure out where to stuff 60 bytes of VGA manipulation code though, m… |
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Post #Ad7ZIZ5IApcCgB1jzU by [email protected] |
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turns out the copyright notice is 63 bytes long |
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Post #Ad7ZR7uKaNMGzwyz7w by [email protected] |
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@foone deluxe? |
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Post #Ad7ZR7yELsTfC2o6Cm by [email protected] |
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@JLab8 No, the original. I have a lot of hate for deluxe |
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Post #Ad7ZX2HMQRFbHMZXpw by [email protected] |
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@foone it sounds like what is quickly becoming apparent is that EGA wasn't … |
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Post #Ad7ZX2LGBwMzTSOeum by [email protected] |
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@ranvel well, I mean, this is the video card where they programmed the BIOS to … |
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Post #Ad7ZjarlemeA1Zabb6 by [email protected] |
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MY FLOPPY DISK HAS DEVELOPED A BAD TRACK ZERO?TRANSPHOBIA! |
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Post #Ad7aInI7S8EQhAhSbo by [email protected] |
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and another.I even tried on a different disk. HOW MANY FLOPPIES ARE GONNA DIE O… |
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Post #Ad7aUvulDXxyumYwF6 by [email protected] |
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I grabbed another random floppy disk and it turns out it has been formatted wit… |
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Post #Ad7agbEbvkRGFiPV3o by [email protected] |
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@foone ....what. |
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Post #Ad7agbIrfvqESuOtgu by [email protected] |
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@x4nw I suspect this was the fault of Foone. That fucker is always doing weird … |
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Post #Ad7armpRAGfHObyCAq by [email protected] |
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@x4nw yep. confirmation:https://twitter.com/Foone/status/1455304578606370819 |
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Post #Ad7bIaIFsVeaKzEACG by [email protected] |
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I love that it's 2023 and I just did "copy *.* A:" like it's … |
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Post #Ad7cIBJ0skRWnFxC5Y by [email protected] |
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There we go. The trans-continental railroad tycoon. |
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Post #Ad7cVsxRtaFTwWOyUC by [email protected] |
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if you go into the game to see what's what, it turns out the blue is clear … |
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Post #Ad7cd8L36oulfjtf6m by [email protected] |
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also, my trans agenda has apparently sunk the city of Redding, CA. |
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Post #Ad7hT6fexC0VNKZjHc by [email protected] |
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@foone considering what's going on in that city, that's perhaps a good … |
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Post #Ad7hT6kGg3h3bcjPSy by [email protected] |
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@12 I don't know what's happening in Redding so I'll just assume th… |
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Post #Ad7hrD94X9F8PBpJY0 by [email protected] |
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@foone totally here for the cool and refreshing pink lemonade ocean |
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Post #Ad7hrDDKHKe6cNoiB6 by [email protected] |
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@thepi that's the gender fluid! |
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Post #Ad8xlhci64fTcP2qNU by [email protected] |
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@foone @12 want to find the portal to a rabbit hole? look into the Bethel Churc… |
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Post #AdMZnKsLxvs4xa2x16 by [email protected] |
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so I figured out the patterns of the tile types 5 and 8 (they're identical!… |
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Post #AdMbXafffdsbDvjb6m by [email protected] |
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ugh. I'm gonna have to write some hacky code to explore the map and figure … |
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Post #AdMbhZOjG97uAdZJ8i by [email protected] |
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anyway here's my partial rendering of a full Railroad Tycoon map. All unhan… |
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Post #AdMztesb6NxhXxpuWe by [email protected] |
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You ever stay up until 5:30 am and you're really really tired but you also … |
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Post #AdOPB3Km7sIOKHMpM0 by [email protected] |
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I have taken 1,324 screenshots. that should help. |
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Post #AdQ7YbhT6tvuiCz2bg by [email protected] |
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okay I have now similar-image recognized my 1324 screenshots.There are apparent… |
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Post #AdQ88MduZROGRBN0MK by [email protected] |
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FUCK something in my recognition is wrong. Those numbers are not correct |
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Post #AdQ8UhZXR5ppigyZKS by [email protected] |
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FUCKmy recognition is right.my screenshots were NOT. I think my program was tak… |
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Post #AdQ8kBkjVXClfPb43k by [email protected] |
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yeah look.two cursors. that's not right. |
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Post #AdQ8tZUuauMbusfeCW by [email protected] |
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ARGH this process already takes 15 minutes to run and now I need to fix it by s… |
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Post #AdQB0CKJLFATzL02bI by [email protected] |
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I ran it again... and it didn't work. FUCK |
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Post #AdQE2k7kxD7RFd250i by [email protected] |
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okay. regenerated. 197 grains, 196 livestock. |
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Post #AdQEJzqNlGzqvb8JU0 by [email protected] |
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(0, 118), (1, 137), (2, 156), (3, 175), (8, 14), (9, 33), (10, 52), (11, 71), (… |
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Post #AdQFSdToNbSg7yG8Om by [email protected] |
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okay I gave up and just stuck the list of known positions into the script. Here… |
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Post #AdQGw4lu5XM17jK89Y by [email protected] |
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this is terrible. did you even pay attention to what you were making, Sidney? |
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Post #AdQH43ymuwmSz29uSW by [email protected] |
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I of course mean these 4 stray pixels.whatta heck |
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Post #AdQI0Kj6oI1Jifbu88 by [email protected] |
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wow. the river layout code worked first try! I'm a better programmer than I… |
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Post #AdQIHzVURWkx7WezQW by [email protected] |
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uh oh. there's some incorrectly placed blocks |
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Post #AdQIPw9um5Qj3NMDk8 by [email protected] |
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hmm. I can't load up the riverworld (damn you Philip José Farmer!) because… |
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Post #AdQJoCdxEl9B5EXj3Q by [email protected] |
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okay I have a HALF RIVER WORLD, which does load properly. |
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Post #AdQK7RyQSpNk8CIQ5o by [email protected] |
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@foone wouldn't it be fun to have different cursors for left and right clic… |
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Post #AdQK7S2gD0miLOHoiu by [email protected] |
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@1000millimeter isn't that just Portal? :) |
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Post #AdQL8PSVOpXMZjO3Lk by [email protected] |
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okay I think I've found a problem.I can generate single-tile maps and they … |
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Post #AdQLFXM4RL1D5lm9gW by [email protected] |
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so I think I've fundamentally misunderstood how this works.my theory was th… |
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Post #AdQLMeQaXdfP3UHUS8 by [email protected] |
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but I don't think this is actually how the game works. I think it's mor… |
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Post #AdQLVkhmZWXV88fBYW by [email protected] |
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meaning my individual per-tile work isn't helping. fuck.I'm gonna need … |
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Post #AdQMYnkjnUF1PC3zaC by [email protected] |
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@foone I fear I don't know portal |
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Post #AdQMYnozXfdzcO3ODI by [email protected] |
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@1000millimeter well one of the main mechanics involves creating wormholes in s… |
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Post #AdQMmrrzHsASECA5wm by [email protected] |
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anyway I have touched that shit yet, but I finished up the ocean stuff: |
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Post #AdQP4lZlctD7pRIm12 by [email protected] |
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gah this is weird.the tracks tilesheet is 20x20, right? but the rest of the til… |
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Post #AdQQIV8rcjyIrspb3A by [email protected] |
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found another bug:the game doesn't use the same bridge logic for AI players… |
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Post #AdQRHjJ3ZjdqSknKxE by [email protected] |
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completely normal train layout |
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Post #AdQRPYUreIGVFp37C4 by [email protected] |
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oh godyou can have double tracks, right?but where are the tiles for the double … |
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Post #AdQSebMBOijMQEj8NM by [email protected] |
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I thought I might could cheat and just pull the generated tiles from RAM but I … |
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Post #AdQTydKxqPlgJHGyae by [email protected] |
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yeah I can't fully decode this (TOO PLANAR) but I'm pretty sure there&#… |
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Post #AdQUS6edvE53dNWzPk by [email protected] |
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yeah it seems to basically draw the regular track, but it offsets it tangent to… |
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Post #AdQVu4z3pKlMVzz3ey by [email protected] |
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gah.There's 4 types of stations: and three types of stations in the tiles.t… |
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Post #AdQWyzKmMMnwOY2yOm by [email protected] |
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they store the type of the station outside of the tracks list, which is weird. … |
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Post #AdQX7bMKrpLKe0skxk by [email protected] |
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anyway this is where I'm leaving it for now:stations are all rendered as De… |
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Post #AdQexytzHQpoOlXvTk by [email protected] |
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@foone This started me thinking what was their minimum target spec.Much of this… |
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Post #AdQexyyF1cEmbxXK6q by [email protected] |
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@pare the original minimum specs were 512kb ram |
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Post #AdR6fAeaA4kK3l9weW by [email protected] |
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@foone I distinctly remember the instructions telling me that there were forbid… |
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Post #AdaXIWQDVWyo66VJhY by [email protected] |
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THEY FUCKING THUNK INTO THE GRAPHICS DRIVER TO READ MAP CONTENTSI suspected thi… |
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Post #AdaXbx74UiegNfoXei by [email protected] |
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in any case I have discovered that the tile ids used when the game is running a… |
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Post #AdaXbxBKEu3earnwHo by [email protected] |
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this is done for a simple understandable reason:Sid Meier hates me personally |
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Post #AdaYMbMJC5DeWPBXuq by [email protected] |
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The in-memory tile IDs are: 00 Clear01 Forest 02 Desert03 FootHills04 Hills05 M… |
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Post #AdaYf3liJ1HlqTrzLE by [email protected] |
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anyway it's proving how terrible this question is.I want to find where the … |
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Post #AdaYw4sxPGwUESNAbQ by [email protected] |
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and yeah, that VRAM is memory mapped, but not directly and not completely. You … |
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Post #AdaYw7fx25JyszJKFM by [email protected] |
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and I can't easily decode the function that does it, because it's not i… |
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Post #AdaYw8TE4sjjLoMg3E by [email protected] |
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the worst part is that while there is a get_map_tile_at_position function, it g… |
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Post #AdaYw9FnAJaJmR5Ska by [email protected] |
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and each one has to toggle through multiple EGA planes to fully pull out ONE si… |
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Post #AdaYwA3QBnHeGMJ66i by [email protected] |
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so the EGA planes get manipulated something like 768 times EVERY TIME YOU SCROL… |
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Post #Adaa1ELFm89sxkd3B2 by [email protected] |
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@foone uh, fascinating :DI wonder how you found out and how is the code like. (… |
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Post #Adaa1EPrUzqRC2mjMO by [email protected] |
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@korpiq I found out through a combination of DOSBox's debugger and Ghidra |
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Post #Adaalctko6cmRatDF2 by [email protected] |
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uVar1 = (uint)('\0' < (char)(*(byte *)(*(int *)(y * 2 + 0x241a) + (x… |
