Re: PET 2001 fix Part 3 - RAM/ROM board etc.

----- Original Message ----- 
From: "Philip Lord" <random6000@mac.com>
To: <cbm-hackers@musoftware.de>
Sent: Thursday, May 12, 2011 4:15 AM
Subject: PET 2001 fix Part 3 - RAM/ROM board etc.


>Hi all,
>I'm trying to get my second 2001 motherboard working.
>Ethan recently sent back my two boards, one fully fixed and working, and
>one partial fix with lines running vertically down the screen, probably
>caused by a stuck bit somewhere.
...
>Now onto the non functional PET. As I mentioned, there is no RAM. The
>screen appears as a bunch of random blocks  (and they change position each
>time on restart). with vertical lines through them (probably the lines
>caused by the stuck bit that Ethan mentioned). Can someone tell me if these
>blocks are what you would expect without any RAM installed? Again, I'm not
>sure if I can make any progress until I get the RAM/ROM board up and
>working first.
-------

Have you tried replacing the video RAM?


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