John:
-----
However when I replaced the suspect 175, no sounds, and when I put the
original 175 back in the (now socketed) PCB, I don't get the sounds even
with the Bugtrap the same way.
-----
Hmm, the only similar thing I've seen is a bad -5V reg (7905) on Atari
Roadblasters in the sound section. Putting my logic comparator on one of the
chips fixed a problem with the scrolling playfield, but killed the sound.
Take it off, it scrolls again, sound works.
Replacing the voltage regulator fixed it. The voltage on the pulse to sync
that section of the board was low.
You'll have to Google this or give me a deal on that pinout cart :) and I'll
dig the particulars back out. This sounds somewhat similar.
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Received on Wed Feb 23 09:52:20 2005
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