Abstract

This chapter provides an overview of CP/M Operating System. An operating system” can be defined as the interface between the computer and the operator. CP/M (control program for microprocessors) was developed by Gary Kildall of Digital Research to support 8-bit floppy disc-based personal computers in the mid-1970s. It has now become the de facto standard for such machines, and although primarily written for 8080/8085/Z80 systems, CP/M is now available on machines that employ different central processing units. Several versions exist, but CP/M 2.2 is the most popular. CP/M is a single-user operating system. The assembler that is supplied with most CP/M systems is the 8080 assembler ASM.COM. The Z80 equivalent is named ZASM.COM. MP/M (Multiprogramming control Program for Microprocessors) is the multiuser version of CP/M. Additionally, MP/M gives the facility of message mailing, that is, messages can be sent from one user's VDU to another.

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