Its my birthday today and i bought......
In reply to bigbadron (msg # 12):
Another ZX-81 builder here, but my first was an old S-100 buss machine by SD Systems with an 8" Shugart floppy. Got it in a swap. Couldn't keep the bloomin' thing running for more than a week - voltage regulators kept going out on the boards, especially the memory board. I had a drawer full of regulator chips I kept on hand (the chip was a 7805, I think?) just to make the repairs.
Gads, that was a while ago...