Re: Random Characters

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Sun, 29 Jan 2012 14:56:25 +0100 Message-ID: <4F255009.9080602@laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 01/29/2012 02:29 PM, Ed Johnson wrote:
> I have a C64 that displays random characters on the screen and locks up when
> powered on. Sometimes it powers on correctly but within seconds displays
> random characters and locks up. I bought it off eBay and it worked fine for
> about a week of heavy use but then this problem started.

The usual suspects in this case are the PLA (906114-01), the 74LS258, 
the CIA that supplies the 2 extra address bits for the VIC and maybe the 
RAM.

Also, if any of the chips I mentioned are in sockets, see if removing 
them and putting them back in helps.

  Gerrit

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