Apple IIe - CP/M v2.20B (1980) by Microsoft
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Published on ● Video Link: https://www.youtube.com/watch?v=mIrFrcxni2I
CP/M Operating System for Z80 machines running on Apple IIe computer with Applicard (contains Z80). The operating system was the de-facto standard in the early microcomputer era, before MS-DOS and Windows. Written by Microsoft in 1980.