General public machines (Was: Altair 8800 name Was: Re: Altair 680 Expansion Boards?

Tor Arntsen kspt.tor at
Fri Dec 23 06:18:59 CST 2016

On 23 December 2016 at 05:45, drlegendre . <drlegendre at> wrote:
urs was no exception, and I thank you for it.
> For one, I hadn't known that CP/M was written originally to the 8080.. I'd
> always assumed it originated on the Z80.

There are only 8080 instructions in CP/M, not a single Z80-specific
instruction. CP/M came about around 1974, the Z80 in 1976.
All the CP/M computers I used had a Z80, but that's just shows what
was popular at the time.

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