Re: VIC-20 diagnostic cartridge

Hello,

I have built the cat and harnesses by myself according to Bo's schematics and can confirm the 1k and 2k2 are right, at least the diag is working correctly with these resistors. I have re-used a VIC-1211A ("3 k Super Expander") as this cart already contains 3 k RAM and a ROM socket. I desoldered 2 k RAM as only 1 k is needed by the diag software.

Regards
Mario

Baltissen, GJPAA (Ruud) schrieb am 05.07.2017 07:59:

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> Hallo allemaal,
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> I ran into several broken VIC-20s that I need to repair. One idea is to use a diagnostic cartridge. Not having one the next idea is to build one myself. I found BINs etc. on Bo's site. But one small thing is puzzling me. Two resistors have to be soldered to the cassette port plug. A picture on Bo's site says it have to be a 1K and a 2K2 one. A hand written schematic from Ray Carlsen says it each is a 27 Ohm resistor: http://www.classic-computing.de/wp-content/uploads/2016/01/Commodore_8_Bit_Repair.pdf
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> Does anyone of you have this cartridge and could do me a favour by checking the values, please? Thank you!
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> Met vriendelijke groet / With kind regards, Ruud Baltissen
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> www.Baltissen.org <http://www.Baltissen.org> 
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