Editing MP/M (section)

{{Primary sources|date=January 2009}}
{{Redirect|Network I/O System|the Network Basic Input/Output System|NetBIOS}}
{{short description|Discontinued family of computer operating systems}}
{{Use dmy dates|date=June 2019|cs1-dates=y}}
{{Use list-defined references|date=December 2021}}
{{anchor|XIOS|XDOS|TMP|RSP}}<!-- Parked anchor here for later expansion. Linked to from redirects -->
{{Infobox OS
| name = MP/M
| screenshot =
| caption =
| developer = [[Digital Research|Digital Research, Inc.]] / [[Tom Rolander]],<ref name="itchc"/><ref name="IEEE_2014"/><ref name="Shustek_2016"/><ref name="Kildall_1993"/> [[Gary Kildall]], Frank Holsworth<!-- Francis R. Holsworth --><ref name="Wein_2002"/><ref name="Holsworth_2006"/>
| family = [[CP/M]]
| source_model = Originally [[closed source]], since [[Open-source software|open sourced]]
| kernel_type = [[Monolithic kernel]]
| supported_platforms = [[Intel 8080|8080]], [[Intel 8085|8085]], [[Zilog Z80|Z80]], [[Intel 8086|8086]], [[Intel 80286|80286]]
| working_state = Discontinued
| released = {{Start date and age|1979|||df=yes}}<ref name="mpm1"/><ref name="MP/M_1.0_1979_Spec"/>
| latest_release_version = 2.1
| latest_release_date = {{Start date and age|1982|||df=yes}}
| preceded_by = [[CP/M]], [[CP/M-86]] 
| succeeded_by = [[Concurrent CP/M]], [[Concurrent CP/M-86]]
| marketing_target = 
| language = [[English language|English]]
| ui = [[Command-line interface]]
| license = Originally [[proprietary software|proprietary]], now [[BSD licenses|BSD]]-like
| website = {{URL|http://www.cpm.z80.de/}}
}}
'''MP/M''' ('''Multi-Programming Monitor Control Program'''<ref name="MP/M_1.0_1979_Spec"/>) is a discontinued multi-user version of the [[CP/M]] [[operating system]], created by [[Digital Research]] developer [[Tom Rolander]] in 1979.<ref name="itchc"/><ref name="mpm1"/><ref name="MP/M_1.0_1979_Spec"/><ref name="Evans_2004"/><ref name="IEEE_2014"/><ref name="Shustek_2016"/><ref name="Kildall_1993"/> It allowed multiple users to connect to a single computer, each using a separate [[computer terminal|terminal]].

MP/M was a fairly advanced operating system for its era, at least on [[microcomputer]]s. It included a priority-scheduled [[computer multitasking|multitasking]] [[kernel (operating system)|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.