Not quite.
CP/M is not a rename of PL/M.
PL/M is a derivative of the programming language PL/I and was used in the development of
CP/M - it is not an operating system.
CP/M-86 was a later development of CP/M that was designed to run on 16-bit Intel
processors.
CP/M-68K was another branch of CP/M for use with Motorola 68K processors.
From: "Murray McCullough via cctalk" <cctalk(a)classiccmp.org>
To: "cctalk" <cctalk(a)classiccmp.org>
Cc: "Murray McCullough" <c.murray.mccullough(a)gmail.com>
Sent: Friday, May 3, 2024 4:46:54 PM
Subject: [cctalk] CP/M
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 70ās; early 80ās. It
came from PL/M, (Programming Language for Microcomputers) later renamed
CP/M(Control Program for Microcomputers). Iām 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 š