I have both these games and for the life of me cant seem to turn off the attract mode sounds. The only dips i can find are the 4 banks of 8 dips on the cpu board which are listed and 1 bank of 4 dips on another board in the top left.
Some google searches have found how to turn off System 80 attract sounds (dips on soundboard) but not for System 80B as there doesnt seem to be any dips on that board.
Any ideas? Is it possible?