Vic display issue

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Vic display issue

Postby Meall » Sun Dec 10, 2017 1:01 pm

I have a Vic 20 that displays a bunch of random characters on screen at boot up.

Im trying to find the issue, but cant find it. I tested all socketed chips in a working one, and they look fine.

I’ve been suggested to look at this link, which suggests it may be a RAM issue: ... /vic20.txt

Any suggestions? Where can I get memory chips if that’s the case?

Vic 20 Amateur
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Joined: Thu Nov 11, 2010 5:46 pm

Re: Vic display issue

Postby cobracon » Sun Dec 10, 2017 9:54 pm

I would look on ebay for the ram chips.

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Re: Vic display issue

Postby lance.ewing » Mon Dec 11, 2017 2:55 am

I had a similar issue. There ended up being multiple things wrong. I had a broken track on the data bus that I discovered by doing connectivity tests. But I did also replace all of the 2114 chips, so I can't rule out one or more of the originals being faulty. My BASIC ROM was also faulty.

This is where I got my 2114 chips:

They're obviously based in the UK though.

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