Customizing INFOCOM(tm) Games
notes on CP/M addresses
I don't know wheather or not this is a duplicate effort, but since
I haven't found a similar listing.......
When I first saw that Infocom was selling off all their CP/M compatible
games for only $14.95 I was overjoyed. Now I could buy all the titles that
I always wanted but could not really afford. Atlast, guilt free software.
I ended up buying Zork1 for the Osborne I, Zork2 and Zork3 for the DEC
Rainbow, and Wishbringer for the Kaypro II. (My computer system is an Ampro
Little Board with Teac 55b and 55f drives. The terminal emulates a DEC
VT100. With my current hardware I can read or write to almost any 5.25"
format.) I thought everything was going to be so simple, use MULTIDSK and
MCOPY to transfer the programs to Ampro format and away I go! Wrong answer.
Although all the programs would execute, the terminal was confused beyond
belief.
Some rainy day time with all the .com files and a trusty debugger
got me all the data I needed to unconfuse the terminal and allow me to
customize the display to just the way I wanted it. Now I'd like to 'share
the wealth' with anyone else bitten by the Infocom bug.
The program starts off with an initial jump to 0200h, the start of
the actual program code. Next comes all the good stuff;
0103h Charactors per line
a 78 charactor line is 4Eh
0104h Lines per screen
a 23 line terminal (excluding status) is 17h
0105h File name of the data file without file extent
must be 8 bytes long, fill with ascii spaces (20H)
if you have ZORK1.dat then 'ZORK1',20h,20h,20h goes here
010Dh Screen LF after CR (1 = yes;0 = no)
010Eh Printer LF after CR (1 = yes;0 = no)
010Fh Inverse video offset
if you can add a 80h to the ascii charactor value to get
inverse video, this byte's for you
The following strings start with a one byte charactor count,
the charactor string, and then a null fill (00H)
0131h Terminal reset string
Put everything back the way it was
0152h Begin status line display
Move cursor to upper left and set video attribute (inverse, bold, etc)
0173h End status line display
Move cursor to lower left and reset video attribute
0194h Printer init. string
room for anything special you need to set up your printer
0200h Start of the program code
I hope you have as much fun with the games as I have had, you can't
beat them at their close-out price. It's unfortunate that they have dropped
their CP/M support, I can't see buying a clone just to play with the
Leather Goddess.
