There was also Concurrent CP/M (possibly only a /86 variant).
On Sat, May 4, 2024 at 2:02 AM Bill Degnan via cctalk <cctalk(a)classiccmp.org>
wrote:
Herb Johnson has some good info on the history of cp/m
here
https://www.retrotechnology.com/#dri
Bill
On Fri, May 3, 2024, 8:23 PM Murray McCullough via cctalk <
cctalk(a)classiccmp.org> wrote:
I came across an article that said CP/M came out
in April 1974. I
remember
using this OS in the microcomputer world in the
late 70’s; early 80’s. It
came from PL/M, (Programming Language for Microcomputers) later renamed
CP/M(Control Program for Microcomputers). I’m not sure what its legacy is
though as far as I can recall it was wrapped up in litigation for quite
some time. It was used in the 8-bit world but not sure what it's role was
in the early PC world!
Happy computing,
Murray 🙂