I have a working Atari 800 (with Happy(r) drive modification) hooked up to a late 70s tv in my basement. 8 bit bus, 64Kb addressable memory

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I collect and use old computer hardware at work as some old system controllers can't use anything else. ISA cards and such.
I won't even describe what I paid $3,500 for in '93.

I still have it and it still works. (I think, I haven't turned it on in a few years.)