RE: LOW VOLUME SOUND C64c

Do you have an oscilloscope?

-----Original Message-----
From: owner-cbm-hackers@musoftware.de
[mailto:owner-cbm-hackers@musoftware.de] On Behalf Of Ed Johnson
Sent: Monday, January 30, 2012 10:10 PM
To: cbm-hackers@musoftware.de
Subject: RE: LOW VOLUME SOUND C64c

I see there are different revisions of the SID chip. I have an 8580R6 Can
I use any 8580 revision SID? Or even use a 6581 ?


Best regards,
Ed Johnson


-----Original Message-----
From: owner-cbm-hackers@musoftware.de
[mailto:owner-cbm-hackers@musoftware.de] On Behalf Of Marko Mäkelä
Sent: Monday, January 30, 2012 2:02 AM
To: cbm-hackers@musoftware.de
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.

	Marko

       Message was sent through the cbm-hackers mailing list


       Message was sent through the cbm-hackers mailing list

       Message was sent through the cbm-hackers mailing list