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I'm working on restoring the machine I posted about here. I've got the CPU board running seemingly fine (after replacing a seemingly bad crystal, and cycling all the DIP switches). I can run simple test programs from the front panel, like the program to add two numbers in the Altair manual...

Thanks, all that is very helpful. The machine does have a third-party Z80 card (and is unfortunately missing the original MITS 8080 CPU card), so what you've said makes sense. Ha, I did look for STL files from someone else before starting on my own design, but couldn't find them! Oh well, it...

I've recently acquired an Altair 8800 from the widow of the original owner. Unfortunately, despite my best efforts at ensuring that it would be packed well, it wasn't, and sustained some damage, mostly in the form of broken card guides. I understand that's common, and I've designed and am 3D...