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Some obscure jamma questions
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CheffoJeffo:
I'm still confused -- JAMMA uses onboard amplification, so the game board obviously has to be plugged in.

There are some boards that are sometimes called "JAMMA" (because they use a JAMMA pinout) that use an external amp (I have one installed in a cabinet for my kids), but in my experience, they are the exception not the rule.

Perhaps Ummon can provide some specifics or pictures so that I can understand where he is coming from.

Ken Layton:
The vast majority of JAMMA boards all have an amplifier built into the board. It operates on the +12 volts coming into the board from the JAMMA harness.

Some games like Mortal Kombat (and other late Williams/Midway games) had a seperate sound board, but the speakers were 'jacked through' to the JAMMA edge connector to use the existing JAMMA cabinet speaker(s).
Ummon:
This is what it looks like inside my Capcom Impress. You can see at the far left a bunch of wiring that comes out of the harness, apparently coming from the edge connector (it is looped 180 vs bent 90 degrees from the PS side of the harness) and going into the amp.
CheffoJeffo:
QSound amp ? Not JAMMA and I think it connects with a separate audio cable, although I wouldn't be surprised if it had some sort of pass-through from the harness. I believe that it has its own transformer, so wouldn't use the 12V from the harness.

But, my knowledge on the subject is very limited -- I don't have any candy cabs nor any QSound games.
Ummon:
Ahhhh. Yeah, a Qsound. I noticed I missed pic'ing the stereo RCA plug that goes from the amp to I guess whatever is plugged into it. However, by the wiring and the volume knob on the amp housing it seems mono sound from the edge connector should play through, and with the Tetris board that came with it none did. As well, when I hooked up my computer to the RCA plug, with the PS on of course, there was no sound. I'm not sure how to further troubleshoot this.
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