Sick C-64c - test-drb@ccmp.vtda.org

8 Sep 1997

The floppy drive incidently, works on other c64's just fine, and I have
cleaned and calibrated it.

----------
...
  From: jpero(a)mail.cgo.wave.ca
 To: Discussion re-collecting of classic computers
&lt;classiccmp(a)u.washington.edu&gt;
...
  Subject: Re: Sick C-64c
 Date: Monday, September 08, 1997 4:38 AM

 > Date:          Mon, 8 Sep 1997 08:22:06 -0500
 > Reply-to:      classiccmp(a)u.washington.edu
 > From:          "Bill Girnius" &lt;thedm(a)sunflower.com&gt;
 > To:            "Discussion re-collecting of classic computers"
&lt;classiccmp(a)u.washington.edu&gt;
...
   Subject:      
Sick C-64c
 X-To:          "Classic" &lt;classiccmp(a)u.washington.edu&gt;  
 > I recently aquired a stack of c64's, these are the old brown type. Of
(4),
...
  > One works fine, 1 boots, and can run catridges,
initializes the floppy on
...
  > boot, but can never access it after boot, the
other two have power but no
...
   video.  Any
ideas on these folks?  
 Checkerboard or no display usually means memory is bad, replace all 
 64k ram chips.

 Oddball problems usually traced to the VIA ic's blown by unbuffered 
 lines.  Real easy to do to blow it if careless!

 Make sure you put the shield back on with those finger "pads" coated 
 with bit of heatsink paste on them, they're like poorman's heatsinks!
 The video IC get brutally hot!

 Monitor the voltages for stablity and good idea to replace those big 
 capacitors just in case.  The floppy drives I think is belt driven 
 type and needs bit of cleaning.  I had a problem with one, inside 
 that small can there's 2mhz crystal and one TTL chip, That TTL chip 
 was baddie.

 Jason D. 