For a REALLY wild fix, if you get a rolling playfield
on Roadblasters, you will need to change the speech
chip.
Tony
--- "Robert C. Bullock" <rcbullock@cox.net> wrote:
> 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 10:12:20 2005
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