CP/M (Originally Control Program/Monitor later Control Program for
Microcomputers) we developed by Gary Killdall in at Digital Research,
Inc.  1974.
CP/M-86 was released in 1981.
CP/M-68K was released in 1982.
On 5/3/2024 7:11 PM, Norman Jaffe via cctalk wrote:
  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 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 🙂