Commodore 64 dead at a guess

blast · 11 June 2010, 12:41

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.

Cheers

rossb · 11 June 2010, 12:48

Hi Blast,

This may be of use Page 66 onwards

ftp://ftp.scs-trc.net/pub/c64/Tools/...pair_Guide.rar

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

http://personalpages.tds.net/~rcarlsen/cbm/c64-ic.txt

Regards,

Ross.

blast · 11 June 2010, 14:31

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.

Cheers

Amiga1992 · 11 June 2010, 17:58

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.

11 June 2010, 12:41	#1
blast Total Numpty Join Date: May 2010 Location: Lazy town Posts: 20	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. Cheers

11 June 2010, 12:48	#2
rossb Registered User Join Date: Apr 2010 Location: Worthing/UK Posts: 117	Hi Blast, This may be of use Page 66 onwards ftp://ftp.scs-trc.net/pub/c64/Tools/...pair_Guide.rar and possibly this one. sounds like a ROM or PLA problem to me: http://personalpages.tds.net/~rcarlsen/cbm/c64-ic.txt Regards, Ross. Last edited by rossb; 11 June 2010 at 13:06. Reason: Link addition

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11 June 2010, 14:31	#3
blast Total Numpty Join Date: May 2010 Location: Lazy town Posts: 20	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. Cheers

11 June 2010, 17:58	#4
Amiga1992 Registered User Join Date: May 2001 Location: ? Posts: 19,651	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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