Tony, your HP
sounds like the first single-unit ready-to-use desktop
computer, but that's not the same thing. I bet it was appallingly
expensive, and with a calculator display what it could do would be
very limited - a great deal less than a 1K ZX-81, I would think...?
I'll grant that it was expensive (I would guess about $6K). But it
certainly wasn;t limited and could do a lot more than a 1K ZX81.
But I could get a ZX81 back then. I just found out about HP puters here
on CCTALK.