[vcf-midatlantic] IBM FSU Static RAM Board...for S-100?!

Systems Glitch systems.glitch at gmail.com
Thu Jan 21 10:02:54 EST 2016

This has to be one of the most unexpected S-100 boards I've acquired. The seller says this was created due to the need for denser RAM boards for IMSAI 8080's at IBM's Advanced Systems Development Lab in Los Gatos, California. Apparently FSU RAM was the densest static RAM available at the time, and of course they had access to it, being IBMers. Extra boards were produced for engineers with S-100 machines at home. I wrote up what I know about the boards here:


Fortunately they came with a copy of the 3-page manual and a (very faded) blueprint copy of the schematic. I've digitized both and made them available. I've tested one of the boards so far, which works fine with my IMSAI 8080 and a 2 MHz 8080 CPU board. I'd be interested to hear if anyone else knows anything about these, or has one, or has spare FSU RAM modules they'd be interested in parting with. 


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