It has recently been found out that on B boards 93646B-3 and 93646B-4 there is a suspected routing error for one of the pins from PAL 3.
This means that if you are doing a game conversion using on of these B boards, you cannot natively use the BGSB3G PAL chip, you will have to either lift pin 9 of the PAL and solder a wire to C13 of connector CN3 or use PAL BGSB3F, lift pin 7 and solder a wire to C13 of connector CN3.
4 Responses to “A note on CPS2 conversions”
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hi! i had this problem when i tried to make a conversion of a street zero 2 alpha on childrem childrem of atom board, image ok, but the sound was quickly and all wrong, may be this post the solucion?
Please do try it and report back. Hope it helps
i got doubt about incompatibility on somes revisions
i’ve done an progear no arashi conversion on a 93646B-4 revision board and got somes stranges sounds. I was at first thinking about an bad eprom program or my homemade G pal but no.
So i swapped eprom to another board (vampire hunter) which worked
BTW, vampire hunter is in a 93646B-4 board now and working perfectly,since it got an F pal
thanks for the tip !
Good stuff. I’m amazed this wasn’t found out a long time ago. Who knows, maybe it was?