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I've been having a go troubleshooting an Epson QX-10 but know there are some here far more experienced with this system than I am. The problem is immediately on boot it goes into an endless beep with "Diagnostic Code: 0002" shown. It does not reach the point of reading disks or anything else...

Finally, after months of limited time and testing a lot of random things, I managed to fix both of my TI-99/4As to perfect operation! In the process I went down the rabbit hole of understanding production revisions and became much more familiar with the hardware. My first experience with the...

I recently got a Model I (with Level II ROM daughter board, lowercase mod and some other curiosities I'll describe below) that was badly busted and banged up in transit. The exterior is problematic but most of the internals seem in-tact from my initial review, aside from the plastic risers and...