From: Ed Johnson <>
Date: Mon, 30 Jan 2012 22:12:09 -0500
Message-ID: <EAE4BACD820B483DA9D9EA8EA8DE01A0@dell6400>
I see the 6581 uses a 12 volt supply - the 8580, a nine volt supply 
But does the revision on the 8580 SID matter?

Best regards,
Ed Johnson

-----Original Message-----
[] On Behalf Of Marko Mäkelä
Sent: Monday, January 30, 2012 2:02 AM
Subject: Re: LOW VOLUME SOUND C64c

On Sun, Jan 29, 2012 at 04:43:51PM -0500, Ed Johnson wrote:
>I checked the fuse inside. It was good.
>The board is a PCB ASSY #252311 REV 3
>I has a very sharp clear video picture. Better than the older bread box 
>version I tested the power supply with.
>Any other ideas?

Could the SID chip be damaged? Over 20 years ago, I damaged a SID chip in an
old-style C64 (+12V VIC and SID) by hot-plugging the audio output to a
stereo receiver that was also hooked to an antenna amplifier that may have
been powered from a different mains voltage phase. This could have caused a
ground current.  I cannot remember clearly, but I think that the audio was
very quiet after the incident. Replacing the SID chip cured it.


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Received on 2012-01-31 04:00:24

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