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    Error on recently rescued Sperry PC

    My board looks pristine without any damage as can be seen here: https://drive.google.com/file/d/1EivfCJdLwdnEPcx9NiT12BoVghCPYpMO/view?usp=sharing (including a link to a high resolution pic). I think the error has something to do with power supply issue. I have measured on each TTL chip's VCC...
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