MP/M

MP/M (Multi-Programming Monitor Control Program) is a discontinued multi-user version of the <a href="/facts/CP/M/n5rTgXdC">CP/M</a> <a href="/facts/Operating_system/8XTuvMh2">operating system</a>, created by <a href="/facts/Digital_Research/9bYQl2pI">Digital Research</a> developer <a href="/facts/Tom_Rolander/27HPXfpM">Tom Rolander</a> in 1979. It allowed multiple users to connect to a single computer, each using a separate <a href="/facts/Computer_terminal/fSlx05qV">terminal</a>.
MP/M was a fairly advanced operating system for its era, at least on <a href="/facts/Microcomputer/ETW22UTv">microcomputers</a>. It included a priority-scheduled <a href="/facts/Computer_multitasking/Q4acPNMv">multitasking</a> <a href="/facts/Kernel_(operating_system)/uEj4U3Rz">kernel</a> (before such a name was used, the kernel was referred to as the nucleus) with memory protection, concurrent <a href="/facts/Input/output/WQTE8Jas">input/output</a> (XIOS) and support for spooling and queueing. It also allowed for each user to run multiple programs, and switch between them.

MP/M open-in-new

MP/M