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CHESSFIX.ARK
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Category 3, Topic 15
Message 7 Mon Dec 07, 1987
MARC-LEVINE at 20:05 CST
Fixing Video Chess to Run on Geneve
Ok, the jist of the problem according to Mike Dodd (Micropendium, Nov 87) is
that TI wrote the to use >8804 for the VDP read data location rather than
>8800. On the 4a they are the same, but not on the Geneve. Mike gives a step
by step procedure for fixing this using TI's debugger that came with the EA
Package and doing it on the Geneve.
It essentially involves changing all the locations in ROM between >6000 and
>7000 (he says the cart only uses the 1st 4000 bytes of ROM) that have 8804
to 8800. I loaded the cart into my Gram Kracker and found them easy. they
are at at:6056,624E,6272,6298,63E0,6416,64B4, 658E,6616,67B8,6B7E,6C80,6C86
& 6C94. those were the locations he gave. Wit the Kracker and the cart I
was using I also found one at 67D1. Curios thing is that although he says
the Video Chess cart did not use the cart rom between 7000 and 7FFF, I found
gobs of stuff there, not just zeros. Anyone know why. Well, I changed the
8804's to 8800's and ran it fine on the 4a. of course I don't know if what
I did would run on the 9640. By the way, I used DSKU on the first saved
file of the cart dumped to disk (that's the rom) and it would also work.
You can find all the 8804's using it. However, it finds all the 8804's even
past >7000. again I don't know why the should be aything there since it is
supposedly unused. Mike Dodd's instructions are Debugger as I said. Using
the GPL loader load the chess cart. Press F1 & F2 to unprotect >6000 and
>7000. Go to basic. You boot the debugger it by doing a "CALL ILR", CALL
LR("DSKn.DEBUG"), CALL LLR("DEBUG"). Press "U". You will now see a period
at the bottom left. to find the locations of >8804 type
F6000,6FFF,8804<ENTER>. You wil see a list of all the occurences.To cahnge
them, type "M", te address and enter. The debugger will print the address
and 8804. Type 8800 and press enter. When finished press Alt= to leave the
debisugger. Go to TI Basic and use th cartridge saver to resave what you
have to disk.
Fixing TI Artist
Use a sector editor to edit the 1st sector of the file ARTPT2 file. At byte
3, change (in hex), 06 to 00. Of course resave to disk. this allows TIA to
load. To fix the save and load picture, find the starting sector of ARTPT3.
Add 27 to it so that you are editing sector 28. At byte 121, change (in
hex) 10 to 00. save do disk. TI Artist will now work fine on the Geneve
except for the Print command.
Download complete. Turn off Capture File.