Digital Research

Operating System


Copyright © 1976, 1977, 1978, 1979, 1982, and 1983 by Digital Research. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, optical, chemical, manual or otherwise, without the prior written permission of Digital Research, Post Office Box 579, Pacific Grove, California 93950.

This manual is, however, tutorial in nature. Thus, the reader is granted permission to include the example programs, either in whole or in part, in his own programs.


Digital Research makes no representations or warranties with respect to the contents hereof and specifically disclaims any implied warranties of merchantability or fitness for any particular purpose. Further, Digital Research reserves the right to revise this publication and to make changes from time to time in the content hereof without obligation of Digital Research to notify any person of such revision or changes.


CP/M and CP/NET are registered trademarks of Digital Research. ASM, DESPOOL, DDT, LINK-80, MAC, MP/M, PL/I-80, and SID are trademarks of Digital Research. Intel is a registered trademark of Intel Corporation. TI Silent 700 is a trademark of Texas Instruments Incorporated. Zilog and Z80 are registered trademarks of Zilog, Inc.

The CP/M Operating System Manual was printed in the United States of America.

First Edition: 1976
Second Edition: July 1982
Third Edition: September 1983

Table of Contents

1 - CP/M Features and Facilities
2 - ED
3 - CP/M Assembler
4 - CP/M Dynamic Debugging Tool
5 - CP/M 2 System Interface
6 - CP/M Alteration


A - The MDS Basic I/O System (BIOS)
B - A Skeletal CBIOS
C - A Skeletal GETSYS/PUTSYS Program
D - The MDS-800 Cold Start Loader for CP/M 2
E - A Skeletal Cold Start Loader
F - CP/M Disk Definition Library
G - Blocking and Deblocking Algorithms
H - Glossary
I - CP/M Messages

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