Hi guys i've done a bit more work today on the sound problem.
Put a socket on Z13 on the driver board replaced the 7404 also replaced U7 on the sound card and now i have some sound for a little while. after starting the game and the sound working it then stops.
if i ground S1 pin 2 of Z13 repeatedly i get a sound if i ground S2 pin 4 i get sound if i ground S4 pin 6 i get sound and i can ground these pins in any order and it works fine if i ground S8 at pin 8 it works once and no other sound will work until reset or powered off.

I do need to replace the caps on this board they all look sad but enough for tonight i'll have another think about it and get back to it another time.
The Rom is a 653 so sound card is obviously from a different game

cheers thanks for your help i'll keep you guys updated.


Wally