here is my cloned PS/2 model 80 memory card design. it's based roughly on the Kingston design but i've shortened it to fit in the 100x100mm footprint that gets you good pricing at certain fab vendors. https://github.com/schlae/ps2_80_memory
time to give it a whirl! unfortunately, i'm getting a "216" error which is a generic "memory module doesn't work" error. as usual with IBM BIOSes, it knows *exactly* which chip is the problem, but this information is thrown away so the user doesn't get confused by an arcane error code. oh wait.
For a moment in the thumbnail I thought that was SLT from the 1960s. What kind of chip packaging is that anyway? It was so weird how often IBM used its own stuff instead of likely cheaper industry standard components.
I'm glad you cooked this up, I've been meaning to do something like this for a long time. Any interesting tidbits you gleamed from the reverse engineering? Any thoughts to using modern chips and/or making a 4mb version?
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https://github.com/schlae/ps2_80_memory
If memory serves, they also had a weird CAD package that was hard to pull into our ICT systems without wizardry.