mirror of https://github.com/wwarthen/RomWBW.git
Mark Pruden
7 months ago
4 changed files with 134 additions and 39 deletions
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Forward - MAP - July 2025 |
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The following article describes how to configure the game Interpreters |
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(COM files) included with this distribution. Specifically this allows |
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the terminal control codes to be changed to your specific needs. |
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Additional to the addresses below, the following address is relevant |
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02D0h File name extension of the data file |
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must be 3 bytes long, fill with ascii spaces (20H) |
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The following link containing the interpreter source code is also useful: |
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https://github.com/erkyrath/infocom-zcode-terps/blob/master/cpm80/zorkcpm.prn |
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========================================================================= |
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Customizing INFOCOM(tm) Games |
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notes on CP/M addresses |
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I don't know wheather or not this is a duplicate effort, but since |
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I haven't found a similar listing....... |
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When I first saw that Infocom was selling off all their CP/M compatible |
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games for only $14.95 I was overjoyed. Now I could buy all the titles that |
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I always wanted but could not really afford. Atlast, guilt free software. |
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I ended up buying Zork1 for the Osborne I, Zork2 and Zork3 for the DEC |
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Rainbow, and Wishbringer for the Kaypro II. (My computer system is an Ampro |
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Little Board with Teac 55b and 55f drives. The terminal emulates a DEC |
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VT100. With my current hardware I can read or write to almost any 5.25" |
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format.) I thought everything was going to be so simple, use MULTIDSK and |
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MCOPY to transfer the programs to Ampro format and away I go! Wrong answer. |
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Although all the programs would execute, the terminal was confused beyond |
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belief. |
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Some rainy day time with all the .com files and a trusty debugger |
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got me all the data I needed to unconfuse the terminal and allow me to |
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customize the display to just the way I wanted it. Now I'd like to 'share |
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the wealth' with anyone else bitten by the Infocom bug. |
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The program starts off with an initial jump to 0200h, the start of |
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the actual program code. Next comes all the good stuff; |
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0103h Charactors per line |
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a 78 charactor line is 4Eh |
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0104h Lines per screen |
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a 23 line terminal (excluding status) is 17h |
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0105h File name of the data file without file extent |
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must be 8 bytes long, fill with ascii spaces (20H) |
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if you have ZORK1.dat then 'ZORK1',20h,20h,20h goes here |
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010Dh Screen LF after CR (1 = yes;0 = no) |
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010Eh Printer LF after CR (1 = yes;0 = no) |
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010Fh Inverse video offset |
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if you can add a 80h to the ascii charactor value to get |
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inverse video, this byte's for you |
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The following strings start with a one byte charactor count, |
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the charactor string, and then a null fill (00H) |
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0110h Terminal init. string |
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Clear screen, move cursor to lower left, set scroll region |
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VT100 = 12 1b 5b 32 4a 1b 5b 32 33 3b 31 48 1b 5b 32 3b 32 33 72 00 |
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0131h Terminal reset string |
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Put everything back the way it was |
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0152h Begin status line display |
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Move cursor to upper left and set video attribute (inverse, bold, etc) |
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0173h End status line display |
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Move cursor to lower left and reset video attribute |
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0194h Printer init. string |
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room for anything special you need to set up your printer |
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0200h Start of the program code |
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I hope you have as much fun with the games as I have had, you can't |
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beat them at their close-out price. It's unfortunate that they have dropped |
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their CP/M support, I can't see buying a clone just to play with the |
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Leather Goddess. |
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Gar Nelson |
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Olympia, Wa. |
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GEnie address ==> G.NELSON |
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