MP/M

MP/M
Developer Digital Research, Inc. / Tom Rolander
OS family CP/M
Working state Discontinued
Source model Closed source
Initial release 1979 (1979)[1][2]
Latest release 2.1 / 1982
Platforms 8080, 8085, Z80, 8086, 80286
Kernel type Monolithic kernel
Default user interface Command line interface
License Proprietary
Preceded by CP/M, CP/M-86
Succeeded by Concurrent CP/M, Concurrent CP/M-86
Official website www.cpm.z80.de

MP/M (Multi-Programming Monitor Control Program[2]) is a discontinued multi-user version of the CP/M operating system, created by Digital Research developer Tom Rolander in 1979.[3][1][2][4][5][6] It allowed multiple users to connect to a single computer, each using a separate terminal.

MP/M was a fairly advanced operating system for its era, at least on microcomputers. It included a priority-scheduled multitasking kernel (before such a name was used, the kernel was referred to as the nucleus) with memory protection, concurrent input/output (XIOS) and support for spooling and queueing. It also allowed for each user to run multiple programs, and switch between them.

MP/M platforms

MP/M-80

The system required a 8080 (or Z80) CPU and a minimum of 32 kB of RAM to run, but this left little memory for user applications. In order to support reasonable setups, MP/M allowed for memory to be switched in and out of the machine's "real memory" area. So for instance a program might be loaded into a "bank" of RAM that was not addressable by the CPU, and when it was time for the program to run that bank of RAM would be "switched" to appear in low memory (typically the lower 32 or 48 kB) and thus become visible to the OS. This technique, known as bank switching was subsequently added to the single user version of CP/M with version 3.0.

One of the primary uses of MP/M, perhaps to the surprise of DRI, was as a "power user" version of CP/M for a single user. The ability to run several programs at the same time and address large amounts of memory made the system worth the extra price.

MP/M II 2.0 added file sharing capabilities in 1981,[7][8][9] MP/M II 2.1 came with extended file locking in January 1982.[7]

Versions:

MP/M-86

Like CP/M, MP/M was eventually ported to the Intel 8086, and appeared as MP/M-86 2.0 in September 1981.[11][12][13] Known revisions of MP/M-86 2.0 were dated 1981-09-25 and 1981-10-05. There also was a MP/M-86 2.1 dated 1982-07-20.[14]

MP/M-86 2.x absorbed some of the technology of CP/M-86 1.1 (BDOS 2.2) to become Concurrent CP/M-86 3.0 (BDOS 3.0) in 1982/1983. In December 1983,[15] a DOS emulator named PC-MODE became available as an optional module for Concurrent CP/M-86 3.1 (BDOS 3.1), shipping on 1984-02-21,[16] and the system was further developed into the MS-DOS compatible Concurrent DOS (BDOS 3.1 and higher).[17] This in turn continued to evolve into FlexOS and Multiuser DOS and as such is still in use in some industrial applications.

CP/NET and CP/NOS

References

  1. 1 2 Digital Research (July 1981) [1979]. MP/M - Multi-Programming Monitor Control Program - User's Guide (PDF) (4 ed.). Pacific Grove, CA, USA: Digital Research. Archived (PDF) from the original on 2017-01-04. Retrieved 2017-01-04.
  2. 1 2 3 Digital Research (1979-08-09), MP/M 1.0 - A Multi-Programming Monitor Control Program for Microcomputer System Development - FUNCTIONAL SPECIFICATION (PDF) (internal specification), archived (PDF) from the original on 2017-01-04, retrieved 2017-01-04
  3. ↑ Information Technology Corporate Histories Collection
  4. ↑ Evans, Harold; Buckland, Gail; Lefer, David (2004). They Made America: From the Steam Engine to the Search Engine: Two Centuries of Innovators. Little, Brown and Co. ISBN 978-0-316-27766-2.
  5. ↑ Shustek, Len (2016-08-02). "In His Own Words: Gary Kildall". Remarkable People. Computer History Museum.
  6. ↑ Kildall, Gary Arlen (2016-08-02) [1993]. Kildall, Scott; Kildall, Kristin, eds. "Computer Connections: People, Places, and Events in the Evolution of the Personal Computer Industry" (Manuscript, part 1). Kildall Family. Retrieved 2016-11-17.
  7. 1 2 3 4 5 Digital Research (January 1982), MP/M II Operating System Release 2.1 Release Notes, Pacific Grove, CA, USA: Digital Research, retrieved 2017-01-04
  8. 1 2 Digital Research (1981). MP/M II Operating System - User's Guide (PDF) (1 ed.). Pacific Grove, CA, USA: Digital Research. Archived (PDF) from the original on 2017-01-04. Retrieved 2017-01-04.
  9. 1 2 Digital Research (1981). MP/M II Operating System - Programmer's Guide (PDF) (1 ed.). Pacific Grove, CA, USA: Digital Research. Archived (PDF) from the original on 2017-01-04. Retrieved 2017-01-04.
  10. ↑ Digital Research (March 1981) [1979]. MP/M - Multi-Programming Monitor Control Program - User's Guide (PDF) (3 ed.). Digital Research. Archived (PDF) from the original on 2017-01-04. Retrieved 2017-01-04.
  11. ↑ Digital Research (October 1981) [September 1981]. MP/M-86 Operating System - System Guide (PDF) (corrected 1st ed.). Pacific Grove, CA, USA: Digital Research. Archived (PDF) from the original on 2017-01-04. Retrieved 2017-01-04.
  12. ↑ Digital Research (1981-09-25). MP/M-86 Operating System - User's Guide (PDF) (1 ed.). Pacific Grove, CA, USA: Digital Research. Archived (PDF) from the original on 2017-01-04. Retrieved 2017-01-04.
  13. ↑ Digital Research (September 1981). MP/M-86 Operating System - Programmer's Guide (PDF) (1 ed.). Pacific Grove, CA, USA: Digital Research. Archived (PDF) from the original on 2017-01-04. Retrieved 2017-01-04.
  14. ↑ http://www.cpm.z80.de/download/mpm86-21.zip
  15. ↑ Digital Research (1984). "PC-Mode bridges CP/M and PC DOS". Digital Dialogue - Employee Newsletter of Digital Research Inc. 3 (1): 3. Archived (PDF) from the original on 2017-01-04. Retrieved 2017-01-03.
  16. ↑ Digital Research (1984). "Concurrent CP/M ships early in response to team effort". Digital Dialogue - Employee Newsletter of Digital Research Inc. 3 (1): 1. Archived (PDF) from the original on 2017-01-04. Retrieved 2017-01-04.
  17. ↑ Digital Research (May 1984). "Concurrent DOS bridges PC DOS, CP/M". Digital Research News - For Digital Research Users Everywhere. 4 (2): 3. Concurrent DOS Release 3.1 is rapidly gaining momentum and support from a wide range of microcomputer manufacturers," Wandryk said. "Some 60 hardware companies have licensed the product since it was released in early March.
  18. 1 2 3 CP/NET - Network Operating System - Reference Manual (5 ed.). Digital Research. November 1982 [1980]. Archived from the original on 2016-11-25. Retrieved 2016-11-25.

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