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CP/M is an operating system running on different computers with Intel 8080 and compatible CPUs. It was the most popular operating system for micro computers, before the 16 bit age started successfully with the IBM PC and MS-DOS. Most computer systems running CP/M were based on a Z80 CPU.

It was developed by Gary Kildall of Digital Research, Inc. as a private project from 1974 on, named Control Program/Monitor. When it became commercial software in November 1977 it was renamed to Control Program for Microcomputers.

CP/M was shipped with the disk models of the Amstrad CPC and the DDI-1 disc drive on one or two System Disks.

CP/M versions relating to the Amstrad CPC

CP/M Archive site maintained by Gaby


MicroDOS (Microcomputer Disc Operating System) is a CP/M clone made in East Germany (GDR) for computers of the brand Kleincomputer (KC). It was available for the KC Compact. Unfortunately it is not 100% compatible with CP/M.


Graduate Software offered a service to copy your original CP/M package to a ROM (thus easier access and more disk space).


These four introduction videos show the basic usage and programming environment of CP/M on a modern Altair 8800 simulator connected to a terminal emulator ("Vince Briel PockeTerm") via serial port. (These videos are made by the person who sells these Altair simulators, so you can ignore the small sales pitch at the end of each video.)

CP/M Introduction
CP/M Programming Environment
Changing CP/M's RAM Size
CP/M Application Demos