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Post AYtbYhPiGeWNdftoQq by [email protected] |
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More posts by [email protected] |
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Post #AYpqeLeWoDagZ98nS4 by [email protected] |
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the best thing about ghidra is that no matter which version you're using, s… |
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Post #AYptGx7U9hhvgFDlgG by [email protected] |
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@foone equates is to Ghidra as the ice cream machine is to McDonald's? |
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Post #AYptGxCRrFg3vdXjPs by [email protected] |
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@kawa exactly |
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Post #AYpvudf27eJ4oyxqro by [email protected] |
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port_out(0x3c4,0xf02);I SO WANT TO EQUATE 0x3C4 TO THE VGA SEQUENCER INDEX REGI… |
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Post #AYpwLWnrj6sFN6uwZU by [email protected] |
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the weird thing is the equates table says it's been set, says there's a… |
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Post #AYpzyaQcTxVBlrMPdg by [email protected] |
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OH GOODY I found a mistake in OSDEVtheir docs on the PC gameport are incorrect |
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Post #AYq043UZqp5zMIorNA by [email protected] |
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and I can't rename some local variables either!? |
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Post #AYq09rt9uCfF6n5ZfU by [email protected] |
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what the fuck, ghidra? |
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Post #AYq4bVqZqhB6flJpKa by [email protected] |
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@foone Did you know the OSDev wiki is a wiki, and relies on knowledgeable peopl… |
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Post #AYq4bVvBZYreu3TVVw by [email protected] |
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@dascandy42 I do know! But I don't have an account yet. |
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Post #AYq4h8TFfqtDuU5cvY by [email protected] |
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@foone FWIW, I believe in IDA this kind of thing mostly happens because they wa… |
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Post #AYq4h8XrOiZm8mFJ6u by [email protected] |
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@dougall yeah I've had that happen. Not here, though. The variable it can&#… |
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Post #AYrZ81fkFZq2QVdDzE by [email protected] |
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okay I've fixed OSDEV:https://wiki.osdev.org/Game_portThey had the introduc… |
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Post #AYrZKQCwqyjJzt4aMi by [email protected] |
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and the IBM Game Control Adapter is mentioned in the August 1981 IBM PC Technic… |
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Post #AYrZKThXrfzGpePYyO by [email protected] |
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mind you, on the IBM PC, just about everything is an optional add-in. You get a… |
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Post #AYralJKGeG7mQTskOO by [email protected] |
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@Infoseepage yup! my own 5150 has the max 640, thanks to a AST SixPakPlus |
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Post #AYrfHelAtO8LzB99v6 by [email protected] |
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@foone Wait, the default was cassette and not floppy ? |
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Post #AYrfHep4etFkBGyGzw by [email protected] |
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@flobo yup! |
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Post #AYrmNxTguZjjSHvADg by [email protected] |
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god. Duke Nukem 1 has so much copy-pasted code.Like, there's a ton of hint … |
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Post #AYrnEFAIOcYtMxmS5g by [email protected] |
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LEARN TO WRITE REUSABLE FUNCTIONS |
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Post #AYrnz4jmz0rgdhiHx2 by [email protected] |
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@foone You know they teach people to specifically program like this in school, … |
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Post #AYrnz4o2jCGeqthga8 by [email protected] |
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@drwho WHAT SCHOOL? |
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Post #AYro7aVsj3T7VTGdZw by [email protected] |
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@foone I bet you it's a compiler macro in the original source. |
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Post #AYro7aa8TEs5ifG2D2 by [email protected] |
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@darkling I really hope so |
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Post #AYromAlTMYu3WPucBk by [email protected] |
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@foone They also have dialog_box_custom. Does that not let you pass a string, s… |
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Post #AYromAq55Qabki4IN6 by [email protected] |
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@goofpunk not exactly. it passes some kind of number that's an index to a l… |
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Post #AYroytsVSSL6uiGsC0 by [email protected] |
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interesting. there's 12 hint-variables which are used to make sure you don&… |
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Post #AYroywfV5GibZFD1pw by [email protected] |
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although I'm looking at DN1, episode 1. Maybe it does do something in DN1E2… |
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Post #AYrpJVlyHCTeEX2hRA by [email protected] |
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@foone want Duke em largely built by one kid? Wouldn't be surprised if it w… |
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Post #AYrpJVqE1NscRj264G by [email protected] |
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@qkslvrwolf Mainly by Todd Replogle (who was 22) with some hints from John Carm… |
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Post #AYrpQXYE3yXtm9xsXo by [email protected] |
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because yeah this was also the era where you'd have 3 separate executables … |
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Post #AYrpmxhrUyARGZACXo by [email protected] |
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like, it has a function that loops through all 16 color indices and sets them t… |
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Post #AYrpn0UV96GLtzw4dU by [email protected] |
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so instead of fade_screen(COLOR_BLACK) and fade_screen(COLOR_WHITE), it's t… |
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Post #AYrrUTLNqZKRnIxclU by [email protected] |
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@foone Extreme inlining? |
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Post #AYrrUTPzZR101b7Iwq by [email protected] |
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@sundhaug92 they're not inlined! |
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Post #AYrsgAG2jasQ1qbNHE by [email protected] |
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naturally instead of a function like "adjust_duke_health(n)" there… |
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Post #AYrsgDFRcHBFIrLRGC by [email protected] |
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todd replogle: look, I know programmers who use function parameters and data-dr… |
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Post #AYrtgC2YCvJHVjruCm by [email protected] |
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@foone i wonder if eduke32 (the source port for duke nukem) changed any of thes… |
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Post #AYrtgC79vmzpk21aO8 by [email protected] |
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@fries different game! that's duke nukem 3D, this is Duke Nukem 1. |
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Post #AYru1Y9PCDUUAPG4hs by [email protected] |
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@foone I love it. Parameter passing is slow and this circumvents it entirely! :D |
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Post #AYru1YCwz2KILOuuES by [email protected] |
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@eniko it's not THAT slow! especially when none of these are inner-loop thi… |
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Post #AYrvFFtPyVnLY7saTg by [email protected] |
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The game starts with these two screens.There's a function to draw Dr Proton… |
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Post #AYrvRoyJNVZrot9zl2 by [email protected] |
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the only difference between the "draw proton"/"draw duke" f… |
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Post #AYrvtQa3epPwHQyndg by [email protected] |
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@foone There are languages/formalisms where you can only pass one parameter to … |
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Post #AYrvtQeJP0ouUcyCGm by [email protected] |
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@darkling you'd think, but nope! this was compiled with Borland Turbo C. |
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Post #AYrw0GQToHgmoVl8Zk by [email protected] |
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@foone refactor the game. |
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Post #AYrw0GVnUVwV50FNrc by [email protected] |
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@geordie I don't have the source! |
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Post #AYrw60MYRi4ujQf1sm by [email protected] |
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there are 5 of these functions in total.Exactly identical, except they point to… |
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Post #AYrx6nZxYqxBKLsClE by [email protected] |
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oh god please don't tell me there's a hidden cheat code that's been… |
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Post #AYrxZIYHzuXPUrgJyi by [email protected] |
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Nope! it's known, it's just slightly mis-documented and tricky to pull … |
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Post #AYryTGKRS1H4oltG9Q by [email protected] |
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@foone Sounds like they may have made heavy use of macros. Maybe they thought p… |
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Post #AYryTGOhCCg31xsemW by [email protected] |
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@bytex64 that's the weird thing: it's being used for all these static s… |
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Post #AYryyrtFqe7oI2FDtI by [email protected] |
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@foone At least it's their own artisnal c&p'd code rather than c&am… |
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Post #AYryyrxVapWmVEEcWO by [email protected] |
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@dalias yeah, they only stole the graphics, not the code! |
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Post #AYrz8hB2XBCzxYFWfA by [email protected] |
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there is some extra code for checking the command line for another code, which … |
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Post #AYs0EfDYpd6tZfq2ds by [email protected] |
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@foone @darkling Is it possible this is some segmented memory/near/far pointer … |
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Post #AYs0EfIWXB51p4A0NU by [email protected] |
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@poeschel @foone At this point, I'm talking out of my arse (I'm not rea… |
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Post #AYs0EfMmHMU02G9P0a by [email protected] |
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@darkling @poeschel yeah, I don't think that's the case. all 5 are in t… |
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Post #AYs0PeLEQisu2ffHe4 by [email protected] |
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@foone ah, duke nukem 1.. was it written in C? do 1991 DOS games use C? or they… |
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Post #AYs0PeP8CE0IElUOiu by [email protected] |
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@fries Yeah, it was C! Borland Turbo C, to be specific.Probably some of it was … |
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Post #AYs0yck0N8t9DJvgFk by [email protected] |
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okay so the unused hint is supposedly for the teleporter, according to the modd… |
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Post #AYs1Umn8XYC3eSjKyG by [email protected] |
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@foone Could this be the result of compiler inlining? |
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Post #AYs1UmrOHjb1reijbM by [email protected] |
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@noam nope! it's not inlined. |
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Post #AYs2XSa0FAMLmxQTE8 by [email protected] |
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getting closer to my goal. I figured out where it sets the variable for duke… |
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Post #AYtVlpaiZklP2ZvQVk by [email protected] |
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Wait wait wait. Either I'm completely misremembering a key part of how one … |
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Post #AYtWoWXXxoUcmGI1w0 by [email protected] |
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nope, not misremembering. See this message? You can only save games in the betw… |
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Post #AYtWwVHMXIfRBPWavo by [email protected] |
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so why in the fuck does the game save your position in the level and the camera… |
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Post #AYtX40qBaZol64OTGi by [email protected] |
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and apparently the game ignores the camera position, but not the player positio… |
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Post #AYtX40uRKlDjJGNrto by [email protected] |
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so... if you set up a savegame so it puts you in an actual level instead of a h… |
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Post #AYtXW5Bd1aqagRoAGO by [email protected] |
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yep. you can have it load you right into a level. you can't save a game the… |
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Post #AYtXnkn3b2Psdck17w by [email protected] |
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I was gonna say that it would make sense if they originally had a save system t… |
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Post #AYtXwTA6VVi6ZTg31M by [email protected] |
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but yeah: despite it technically being visible for 32 years, I never noticed th… |
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Post #AYtYPnrubEybBo9hho by [email protected] |
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guess I'll have to find out where it shows the "you can only save in h… |
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Post #AYtYXXe0nx47BhLNgG by [email protected] |
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@foone My guess is that saving outside of the hallway was once planned and then… |
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Post #AYtYXXiyVV2FR5fLPs by [email protected] |
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@thewispsoftime maybe! |
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Post #AYtZOhudMImqNiTCBk by [email protected] |
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I found the part where it shows that dialogbox, it was tricky because it was in… |
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Post #AYtZOkgZ34JaywuVAu by [email protected] |
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it also means there's yet another dialog_box function that's identical … |
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Post #AYtZjGNOvqmp3rj9u4 by [email protected] |
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segmented real mode DOS is so silly.I know this function is a far call (not a &… |
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Post #AYtZjJ6qlqKVXP0U1Q by [email protected] |
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what if instead they JMP to 208F:1BA0? that's the same linear address! |
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Post #AYtZjJsLvEKLujEQ40 by [email protected] |
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or any of the 256 other possible addresses for the same fucking function? |
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Post #AYtaA9tz70LunenDd2 by [email protected] |
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> Exception while decompiling 208e:4094: Decompiler process diedthis would b… |
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Post #AYtaeuctxKnGOuT0G8 by [email protected] |
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oh god this code better not be jumping into the middle of an instruction |
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Post #AYtaexpQ3FaaKbLXge by [email protected] |
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it's always fun to find things like that while looking at disassembly. it&#… |
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Post #AYtaeych630KnQOtUW by [email protected] |
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here there be dragons |
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Post #AYtbYhPiGeWNdftoQq by [email protected] |
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@foone whats the difference then? Access rights to specific segments? |
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Post #AYtbYhUJzWCvry3UcC by [email protected] |
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@f4grx no access rights yet! there are no protections at this point.the differe… |
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Post #AYtbmqkyKNcmfZafpI by [email protected] |
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@foone wait what??? I've been wanting to play that level since 1992! |
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Post #AYtbmqpa3FJKtrkM0e by [email protected] |
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@foone ahh satisfying. Mildly interesting that beating the level doesn't pu… |
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Post #AYtbmqtTokQj5xZT5U by [email protected] |
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@adamrofer oh, does it? interesting. I didn't try beating a level in that s… |
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Post #AYtbmqynUygRMS3iNM by [email protected] |
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@foone then the demo becomes a replay of your run too apparently! Ah the"R… |
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Post #AYtbmtcvejyPZUqnCq by [email protected] |
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@adamrofer Also you can just play it as map 1 of episode 2.although interesting… |
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Post #AYtcgB4OVNCrb53cIq by [email protected] |
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NOPE! it just checks if you're on an even level, and then tells you to fuck… |
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Post #AYtcgDisdomPpE0yga by [email protected] |
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idea: what happen if I sabotage this check and make it always let you save? |
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Post #AYtcgETfpqD6ALuLce by [email protected] |
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it's time... for hax |
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Post #AYtcgFEp0XvMWZy06y by [email protected] |
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75 09 ; JNZ +9turns intoEB 09 ; JMP +9 |
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Post #AYtcgFzyBFdcso1ebI by [email protected] |
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There we go! I'm saving mid-level. |
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Post #AYtcgGl7LxLtF25J5c by [email protected] |
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and it loads properly. Nothing about the level state is saved (other than your … |
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Post #AYth0OTWm0yImVhzf6 by [email protected] |
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okay I think I know why they disabled mid-level saving:so, they don't save … |
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Post #AYth0RWTRW6wEW6tAe by [email protected] |
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the gun powerup is unique in that it can be collected multiple times. The game … |
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Post #AYth0SHccDpCakAXey by [email protected] |
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but that's not the case with the gun powerup because you collect up to thre… |
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Post #AYth0T2lmvXSwyEC9I by [email protected] |
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and if you can save mid-level, your gun powerup state is saved. So you enter le… |
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Post #AYth0TnuxdFjJCHqdc by [email protected] |
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and making you save only in hallways avoids this. And the game stores the state… |
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Post #AYth0UZ48KxzfQLV7w by [email protected] |
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so you can't use this trick.now I think they could have solved this in anot… |
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Post #AYth0VJrKMOg0YEs40 by [email protected] |
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but maybe they didn't figure out this exploit into late in development and … |
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Post #AYth0W4eWNpMLg8F04 by [email protected] |
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you can also use this trick to get infinite health, but that's a much less … |
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Post #AYth0Wpnh5XchuBtUO by [email protected] |
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oh interesting.the game does reuse a dialog box! just one of them: The main-hal… |
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Post #AYth0XbIqTXT5EPpWy by [email protected] |
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the game selects what message to play based on your current level. on odd-numbe… |
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Post #AYth0YMnzrXJSYdlZY by [email protected] |
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my ghidra is full of a lot of comments like "this actually points to keybo… |
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Post #AYth0Z8J9FX9psrhc8 by [email protected] |
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ghidra really doesn't do a great job of handling 32bit pointers in a 16bit … |
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Post #AYth0ZtoIdX0DD5dei by [email protected] |
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So sometimes a function fill be like void foobar(int a, int b, char far * strin… |
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Post #AYth0aexTLFGZR9I92 by [email protected] |
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nope! far pointers are passed as two 16-bit integers but actually represent one… |
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Post #AYth0bPkfMfwuZ2f56 by [email protected] |
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honestly real mode x86 is such an abomination of nonsense that we should preten… |
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Post #AYtjo7dtpaCwxmOria by [email protected] |
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@foone that's a perfectly cromulent technique for saving memory! |
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Post #AYtjo7irX8B5DAipSC by [email protected] |
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@DrHyde and making reverse engineers (like me) cry! |
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Post #AYtn7U1BABxdixDEeG by [email protected] |
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ugh. I don't know what this function even does but I can already tell that … |
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Post #AYtn7X6bgT5LIem71c by [email protected] |
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I'm really doubting the function duplications has anything to do with aggre… |
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Post #AYtn7Xuagd4FngA1w0 by [email protected] |
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optimization level: this is a consumer-grade compiler for DOS from 1988, you… |
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Post #AYtn7YhVkkCQFP36Bc by [email protected] |
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I hope this is just me misunderstanding the purpose of this function and this g… |
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Post #AYtn7ZUmnXcAiE6RzU by [email protected] |
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oh fuck me I think it does |
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Post #AYtn7aI3qL1vB39nnM by [email protected] |
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instead of having a big array called like GameObjects and a big update function… |
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Post #AYtn7b5Kt8RfdsD9bE by [email protected] |
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and a separate copy-pasted function to update each one |
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Post #AYtn7brXzt0g3OlekK by [email protected] |
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I'm going to set this game on fire |
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Post #AYtn7ce75JrGU1URRg by [email protected] |
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oh god it even does it for static things like doorsapparently every frame it lo… |
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Post #AYtn7dRk6nYaxwi4no by [email protected] |
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instead of, you know, waiting until the user pushes the up key, then figuring o… |
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Post #AYtn7eEfAuglPfb93Q by [email protected] |
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also apparently beating the game gives you 34,464 points. random-ass number. |
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Post #AYtn7f1EGLXLqIJvkm by [email protected] |
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at least it doesn't loop over a shoes array, since there can only be one pe… |
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Post #AYtn7fo9KSfWI1D00O by [email protected] |
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I'm now doing some hybrid static/dynamic debugging. I set a breakpoint on t… |
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Post #AYtn7gbQNG5GkqGLoG by [email protected] |
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there's a separate function and array that's looped over for EVERY SING… |
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Post #AYtprmm1xioh7gKjUe by [email protected] |
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@foone This is the exact thing that the previous developer did in the project I… |
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Post #AYtprmqzfGmpN4ehEG by [email protected] |
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@annmygdala are you able to kill them? |
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Post #AYtqJNgWpq3tQ5uzxo by [email protected] |
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my current theory:todd replogle didn't really understand C programming but … |
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Post #AYtqpM6yDkslo3X6Lg by [email protected] |
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@foone 34,464 = 100,000 - 65,536 |
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Post #AYtqpMBDxwHk1FWUym by [email protected] |
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@lizakowski huh. |
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Post #AYtr8Ll3l7IqDELEkC by [email protected] |
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I think that instead of iterating over all the destructable blocks, it instead … |
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Post #AYtr8P1TcXDYL12tFY by [email protected] |
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but I could be wrongI hope I'm wrong |
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Post #AYtr8PokfKdInq6F3Q by [email protected] |
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for some reason, unlike every other enemy, the rabbitoids are handled in the &q… |
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Post #AYtrzlQL44f1A47SGe by [email protected] |
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@foone I can't help but wonder if any of this helps explain Duke Nukem Fore… |
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Post #AYtrzlVIlcd9PSRQ0G by [email protected] |
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@BluJBird nah, he only got "special thanks" credit on that one |
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Post #AYtt09CEmLg8qRGoIi by [email protected] |
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@foone sorry, what is Dark Code? Google and DuckDuckGo were not helpful. |
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Post #AYtt09GqVDMh4jQUU4 by [email protected] |
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@nebojsac I mean bytes that ghidra didn't know are code yet, they haven'… |
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Post #AYttTTHPBk2JWvfbl2 by [email protected] |
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okay so beating the game doesn't give you 34464, it gives you 100,000 point… |
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Post #AYtusmSZ7AH0D3WSAK by [email protected] |
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anyway I think I've found them all and there's 29 mostly-copy-pasted fu… |
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Post #AYtvxwrLyYHFrl92uW by [email protected] |
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okay I'm too fried to keep working on this anymore today.but at least I fou… |
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Post #AYvTrGw4WffBhgIfA0 by [email protected] |
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@foone having recently reverse engineered the entire game logic of Duke 1 mysel… |
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Post #AYvTrH12EDdJx4cctc by [email protected] |
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@lethal_guitar oh neat! Is that info online anywhere? |
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Post #AYvTwzh7Xbddy72Eds by [email protected] |
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@foone nah this is misleading, the rabbitoids are handled like other enemies. B… |
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Post #AYvTwzl1J6l2ACrLii by [email protected] |
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@lethal_guitar ahh, good to know. I was following the addscore calls, so I must… |
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Post #AYvbSYmpooHrSehsW0 by [email protected] |
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@foone unfortunately not at the moment, as I did this in the context of an upco… |
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Post #AYvbSYr5YzgpfqhH96 by [email protected] |
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@lethal_guitar ahh, cool! Carry on, then, and good luck! |
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Post #AYyO0ac6iTt35atvrU by [email protected] |
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@foone For diplomatic reasons, I have refrained for now |
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Post #AYyO0ag0Tz0RHgj2wK by [email protected] |
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@annmygdala I admire your restraint |
