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Old 11 June 2010, 12:41   #1
Total Numpty
Join Date: May 2010
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Commodore 64 dead at a guess

I have come by a Commodore 64 computer. When powered on it comes up with a white square with black surround (I think) and a lot of squiggle in the middle like moving sprites. I am guessing this is fried?

Shame as its all boxed and came with a boxed floppy drive boxed tape deck and boxed joystick. Obviously cant test any of these if the above is broke.

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Old 11 June 2010, 12:48   #2
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Hi Blast,

This may be of use Page 66 onwards


and possibly this one. sounds like a ROM or PLA problem to me:




Last edited by rossb; 11 June 2010 at 13:06. Reason: Link addition
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Old 11 June 2010, 14:31   #3
Total Numpty
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Many thanks for the reply. I'll take a look at the screen again and maybe take a picture to post.

I do attempt minor repairs on any machines but if it gets more technical than screwing a few pieces in and out of involves soldering then thats probably not for me.

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Old 11 June 2010, 17:58   #4
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Black and white sounds odd. Maybe you have a machine that doesn't work with your TV's video norm?

The messed up characters could be one of many things, probably a broken PLA chip. It could also be the Character ROM.
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