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CPM, n. Also spelled CP/M. An acronym for "Control Program for Microprocessors", CP/M was a text-based operating system popular in the late 70s and early 80s. Developed for Intel 8080 and Zilog Z80 machines, it was also ported to x86. Utterly destroyed by MS/DOS (which was derived from CP/M) and IBM's x86 PCs (The PC, XT, and AT). This was the OS used on the famous Osborne portable computers, remembered both for being the first portables, and having a screen smaller than a postcard.
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