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I never had one myself, but I know these single-board gadgets with binary direct-to-memory entry (already hex was luxury back then :D) and 7-seg display. With interest I followed a series of magazine...

I don't think I can really add anything substantial to the quite competent comments already posted by OReubens, except perhaps this:



Already when reading...

Mostly out of curiosity, what MP was it you were using these days? I was mostly writing code for the Z80 in the early 80s, and that had the NOP encoded as 00h (just like the Intel 8080), a value that...

That pretty much looks like plain stack corruption to me: When the saved R11 value gets popped back, the stack memory holding the value has been unintentionally modified in the meantime by whatever....