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Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment. |
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8th Jun 2007, 5:31 pm | #1 |
Retired Dormant Member
Join Date: Nov 2006
Location: Manchester, UK.
Posts: 157
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Commodore 64 Repair
I'd like to get my duff C64 going again but know next to nothing about early computer architecture. I'm getting the blue welcome screen, Ready and flashing cursor, but that's all that happens. It wont react at all beyond that. Any ideas anyone..??
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8th Jun 2007, 9:14 pm | #2 |
Retired Dormant Member
Join Date: Mar 2003
Location: Bishop's Waltham, Hants, UK.
Posts: 939
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Re: Commodore 64 Repair
sounds like the PIA that scans the keyboard. Check the connections to the keyboard are secure first.
Jim. |
8th Jun 2007, 10:12 pm | #3 |
Dekatron
Join Date: Oct 2003
Location: Croydon, Surrey, UK.
Posts: 7,578
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Re: Commodore 64 Repair
I havn't got my old C64 now or the service manual. However I do remember having a similar problem and I ended up swapping the keyboard from another machine (a VIC 20 I think).
Rich.
__________________
There are lots of brilliant keyboard players and then there is Rick Wakeman..... |
24th Jul 2007, 11:44 am | #4 | |
Retired Dormant Member
Join Date: Jul 2007
Location: Brindisi, Italy
Posts: 2
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Re: Commodore 64 Repair
Quote:
The CIA chips are marked 6526 ( more rarely 8521 ), MOS or CSG, and you find them one next the other in the up-left corner of the early motherboards. On the newer boards ( revision E ) you find them split one on the left, the other on the right. The keyboard is controlled by such chip, so if you switch them and the keyboard magically works again, you have a faulty 6526 chip - and we can work on the problem from there to bring your C64 back to life. Riccardo |
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25th Jul 2007, 5:32 pm | #5 |
Retired Dormant Member
Join Date: Nov 2006
Location: Manchester, UK.
Posts: 157
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Re: Commodore 64 Repair
Ok thanks, will give it a try when I've got a mo.
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