An early OS for microcomputer by Gary Kildall of Digital Research for Intel 8080 and Zilog Z80 based 8-bit computers. Actually, when Kildall started writing CP/M, in 1973-4, he didn't have an 8080 system; the first versions were tested on an 8080 emulator for PDP systems. In addition to CP/M-80, DR also created CP/M-86 (works on modern wintel PCs), CP/M-68k (for MC68000 systems), CP/M-Z8k (for Zilog Z8000 systems), and MP/M (a multitasking version), among others.

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