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cyberconfix.readme
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1992-09-24
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Short: patch Cybercon III for WB 2.0
NAME:
CyberconFix
DESCRIPTION:
The virtual-reality game Cybercon III does not work under
KickStart 2.04, but CyberconFix patches the Cybercon III
disk so that it will work under 2.04 (it should also still
work under 1.3, but I haven't tested it).
USAGE:
Just follow these simple steps:
1. make a copy of your original Cybercon III disk with some disk-
copier.
Note: The DiskCopy program that came with your Amiga will crash
at the end of the copy, because Cybercon is not a regular Amiga
DOS disk. Therefore, if you can, use another disk-copier.
2. stick the COPY of Cybercon III into DF0:.
3. type CyberconFix at the CLI prompt. The disk drive light will
go on for about a second.
Note: Before you type in CyberconFix, Make sure the disk is
write enabled. If it's not, CyberconFix will NOT give you an
error message, and the patch will NOT be applied. But you knew
that :-).
4. give your Amiga the 3 finger salute (reset), and enjoy
Cybercon III.
IF-IT-STILL-DOESN'T-WORK:
It is possible that different revisions of Cybercon were released.
If that is the case, CyberconFix will most likely fail :-(.
IN-CASE-YOU'RE-WONDERING-HOW-IT-WORKS:
After spending a few hours with a debugger, I found that there
is a small bug in the keyboard reading routines. The problem
hadn't showed itself under 1.3, only under 2.0, because of the
way 2.0 allocates the CIA chips. (The CIA chips, also known as
the 8520, are involved in reading the keyboard.) The actual fix
turned out to be quite simple; the argument to a branch instruction
had to be changed. The location of this change is at block 149,
offset 159. The value of $36 at this location had to be changed
to $2C.
DISCLAIMER:
If your computer blows up, or any other tragedy happens as a result
of using CyberconFix, I will not be responsible.
AUTHOR:
My name is Blaise Tarr, and I can be reached on the Internet until
at least December 1992. Here is my e-mail address: tarr@cs.psu.edu
If you have any problems with CyberconFix, let me know.