Find here a compilation of excerpts refering to the 8 bit operation system CP/M found in the web.
(Hal Bower wrote on his Home Page:
While the 8-bit CP/M computers may be fading, some of us dinosaurs still keep programming for them.)
CP/M was an operating system originally created for Intel 8080/85 based microcomputers by Gary Kildall of Digital Research, Inc.
Initially confined to single tasking on 8-bit processors and no more than 64 kilobytes of memory, later versions of CP/M added multi-user variations, and were migrated to 16-bit processors.
CP/M stood for either Control Program/Monitor or Control Program for Microcomputers
From Operating System Documentation Project 1:
(Follwing text copied directly from this side including grammatical mistakes)
Gary A. Kildall developed for the company Intel the PL/M programming language for the Intel 8008, derived of PL/I in 1973.
In the same year he developed the operating system CP/M (Control Program for Microprocessors) in PL/M.
It was the first operating system for Intel based computers.
Kildall set up with his wife Dorothy McEwen the company DR Inc.
(Digital Research Incorporation) in 1976. At first CP/M was designed by DR only as a pure file manager program for 8-bit x86 computer and sold by Intel.
In 1976 there was a CP/M Bios for Intel 8080 computers.
At this time CP/M was the dominating operating system on the market and used by the most computer manufacturers on theyre computers.
In 1981 dozens of computer machine types competed under various operating systems like CP/M in numerous variations.
Additional there were proprietary operating systems and UNIX variations.
CP/M was used in 1985 worldwide approximately 4 million times in different versions.
CP/M was renamed to DR-DOS after few other releases in 1988.
CP/M was available in many different versions for numerous application purposes.
Technical further advancements of processors and the trend towards multi-user systems also were included in the development.
MP/M II brought additional commands, multi-user ability with programs like CONSOLE, DISKRESET, SPOOL, SHED and ATTACH.
CP/M plus (CP/M 3.0) could address 1 mbyte of main memory by segmentation the memory areas, harddisk storage up to 16 mbyte was also possible.
|1973||CP/M 1.0|| |
|---||CP/M 1.4|| |
|1979||CP/M 2.0|| |
|---||CP/M 2.2||served as the base for MS/DOS|
|1982||CP/M 3.0||8-bit operating system|
From the Computer Museum Munich:
Gary Kildall programms the first standard operating system CP/M (Control Program for Microcomputers) for the CPU Z80 produced by Zilog.
He used PL/M as development language, derived from PL/I.
In the same year he customized PL/M for running on the Intel 8008 CPU.
Gary Kildall implements his operating system CP/M on the new Intel processor 8080 and
starts in the same year to bring CP/M to market.
Gary Kildall set up the company Digital Research and licensed his own operating system CP/M.
The versions CP/M 1.3 as well as 1.4 has been released.
Digital Research launches CP/M 2.0 (CP/M-80).
This version should be the base of the succeeding MS-DOS.
CP/M 3.0 – the base of the succeeding DR-DOS – was brought to the market.
From Usenet (comp.os.cpm):
A discussion titled Tracing the Evolution of CP/M-80