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Museum of the Game® & International Arcade Museum® Forums
I am working on a second board for an asteriods. the first board works great in the game so there are no faults in the game except for the game board. I have tested the rams and verified the roms off board and on and they are known good. When I lift pin 1 of L6 the dmago line the game will stop watchdogging so I know the problem is in the vector. the crosshatch displays while it is watchdogging so my problem is probably not in the counters. I tried going through the state machine and can follow data going through c8 and d8 and then things start to get wierd on my schematics. A7 pin 4 is high and does not connect to r8. r8 pin 2 does not connect to pin 11 n5 and pins 13 and 12 on n5 are floating. L8 which should be a ls42 is a lm324 which is an amp in the sound section so I am lost trying to figure this problem out. while trying to figure the problem I have tucked pin 1 on L6 back in to its socket