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1/ This circuit can't work, yet it does. I'd chalk it up to a typo, but then the same thing is done for a different sound effect. 556 output is a square wave from 0V to +12V when a sound effect is on. R80/R81 junction swings from 0V to +3V. LM324 outputs a constant -4.95V.pic.twitter.com/yxqgmgoEQM
2/ I know that the LM324's output *must* have sufficient swing to trigger a CD4016 switch gate, as the "LASER" and "TIE" sound effects are continuously playing, and so the CD4016 gates are used to pass or block the effect from the final mixer stage. What is going on here?
What is this archaic sorcery? How dose that work? Lol
Yeah, I know, right? This is the kind of thing that MAME devs have to deal with when wiring up proper sound effect emulation for 70's-era arcade games.
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