I think MS-DOS is considered 16 bit. The early desktop home computers, like the
Sinclair ZX81, Atari, TI-99, Commodore Pet, Vic 20 and 64, Wizard, Radio Shack
Color Computer, and the Apples up to the IIe, I think, were 8 bit machines. I
learned Z80 programming on the Sinclair ZX81, and remember that it used one byte
operation codes. AFAIK, if a computer can only access addresses up to 64
kilobytes and uses 1 byte op codes, it's an 8 bit machine. Or, maybe it depends on
the size of the data bus. I think the ZX81 had an 8 bit data bus.
I'm primarily an AS/400 programmer now, though, and been mostly out of desktop
programming, so I've lost track of all that. {:^>)
CP/M was probably an 8 bit O/S too.
I've heard that Win 2000 will abandon support for 16 bit (MS-DOS) applications,
but there may be MS-DOS emulators available from 3rd parties, just like there are
now ZX81, Atari, etc. emulators that run on PC's.
Take care,
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