Hello friends, I have a problem with sound initialization and BAD ram memory on a B cps2 board, marvel vs capcom game. I've already done several checks.
- I tested the card on another board A and the same problem occurs;
- I've already changed Roms 11 and 12, Roms 1 and 2, pal G, 74lS257 and the problem continues;
- I checked the humpers and they are ok;
- I checked that the continuity of the connections is ok;
Comparing with a board in perfect condition, I noticed that there is no signal on pins 7, 8, 9 that come from CN3 and pins 33, 34, 35 on Roms 11 and 12 that come from CN3 have no signal.
I focused my checks on the region of ROMs 1, 2, 11 and 12. What else could cause this problem?
- I tested the card on another board A and the same problem occurs;
- I've already changed Roms 11 and 12, Roms 1 and 2, pal G, 74lS257 and the problem continues;
- I checked the humpers and they are ok;
- I checked that the continuity of the connections is ok;
Comparing with a board in perfect condition, I noticed that there is no signal on pins 7, 8, 9 that come from CN3 and pins 33, 34, 35 on Roms 11 and 12 that come from CN3 have no signal.
I focused my checks on the region of ROMs 1, 2, 11 and 12. What else could cause this problem?
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