On a side note, it would be a good idea to replace the AMI 6820 you have at U10 for any other brand 6821.
This brand of PIA chips are notorious for going bad & best to swap out regardless.
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Quoted from Quench:I've never seen an AMI 6820 PIA in that type of package. Could be an alternate source they badged as their own.
I have seen this type of AMI chip package before - but only on a couple of occasions. Maybe this type gets overlooked as they don’t have the usual give away large notch & embossed logo to identify.
The AMI embossed logo grey package 6820s & 6810s with an early 1977 date code are quite collectible to ic collectors via eBay, so don’t chuck it out if removing one working or not!
Quoted from perry1670:Collectible chips, I've never heard of such a thing although I guess it isn't surprising really. There is someone out there that collects everything
Yep.
Quoted from Quench:Well, in that case I wonder what these white ceramic suckers are worth.
Quite a bit I would think, possibly hundreds or thousands if you found the right buyer I guess looking at what this seller sold some chips for.
ebay.com link: feedback_profile
Current chips seller has for sale.
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Newcastle, OK
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