Basically, I think one or more of those wires to the sound card are either stuck on ground, or are not grounding at all. If you download the pincoder ROMS and look at the instructions for the sound test you'll have a better picture of how it works. To get the sound card to play a sound, the MPU board grounds a specific combination of those wires momentarily and then un-grounds them. The fact that when connected you have sound playing, albeit the WRONG sounds at the wrong time means the signals to the card are jumbled.Įach of those wires represent a binary digit (ground or no ground). With no signals getting to the card it does like it should and not play ANY sounds. the wires on 10J3 are used to instruct the sound card to play a sound. ![]() Just no background sound in play and then there is that repeating tone in attract mode. So what you are suggesting based on this is that the issue is not with the sound card? Like I said I have speech and other in game sounds. Just quickly wanted to conduct your test of unplugging 10J3. The sound test ROM will be the most use to you. You can also try these test ROMs: They will help you track down problems with your entire machine. if the sound problem goes away the problem is NOT on the sound card. Disconnect 10J3 on the sound card or 1J8 on the MPU board and turn on the game. It could also be a problem entirely on the sound card. What im saying here is that there is a communication problem between the MPU board and the sound card. When the sound increases in speed/intensity like that its because the the sound card has been told once again to play the same sound. ![]() That is, the sound card is told once to play a sound and then the sound card plays it over and over until its told not to. Some of the sounds in williams games are cyclic.
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