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Sometimes it seems you can never tell what you're going to get from ebay. This one looked to be a nice, non-yellowed VIC20.
resulted in disk access. So this was going to be an easy one. The machine was running, just the display that wasn't happening. So, it was the VIC or the possibly the video memory. Neither of those were socketed, so I tried the VIC first, removing the old chip and replacing it with a socket and a known working chip