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 🙂

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&gt; wrote: