[vcf-midatlantic] Can someone diagnose a Vic20 Saturday morning?

Eric Rangell erangell at gmail.com
Tue Feb 22 12:47:23 UTC 2022

Thank you Jeff.  I will also be at the repair workshop Sunday morning, so we can look at it then if it is more convenient.
I did try replacing the 6502 and one of the 6522s but it had no effect.
Thanks, Eric

> On Feb 22, 2022, at 7:40 AM, Jeff S <jsalzman at gmail.com> wrote:
> I will be manning a table at the Swapmeet Saturday until 2PM, so I won't be able to focus my full attention on your VIC-20 until I get back to the Workshop. If you want to stop by my table in the 9032A building, I might be able to do a quick check of the system. I will have my VIC-20 diagnostic cartridge on hand.
> I did learn recently, much to my amazement, that a "black screen" VIC-20 that appears to have measurable logic activity, could still have a bad 6502 CPU. I witnessed this myself after swapping one out in a VIC-20 recently and it fired up just fine.
> Jeff Salzman
> On Tue, Feb 22, 2022 at 7:34 AM Eric Rangell via vcf-midatlantic <vcf-midatlantic at lists.vcfed.org <mailto:vcf-midatlantic at lists.vcfed.org>> wrote:
> Hi all,
> I have a Vic20 that the seller told me was rescued from the garbage.  Looking at it I found 2 issues - photos here: https://twitter.com/RatifyArticle1/status/1495851785885560841 <https://twitter.com/RatifyArticle1/status/1495851785885560841> <https://twitter.com/RatifyArticle1/status/1495851785885560841 <https://twitter.com/RatifyArticle1/status/1495851785885560841>>
> It still doesn’t have video when turned on.  I have a list of the chips to check - they are all receiving power.
> Let me know if anyone will be available to take a look at it and try to diagnose the problem in the CDL sometime between 7am and 1pm Saturday.
> Thanks, Eric

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