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CP/M OS

LAST UPDATED: 08 March 2009 17:02:39 -0600

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CP/M is the predecessor to MS-DOS.  It can be considered the first personal computer Disk Operating System. Intel's Isis is the only earlier Disk based operating system I can think of on 8080 class machines. CP/M-86 was derived from CP/M-80 but for 8086 processors as well, there was also CP/M-68K for 68000 based systems. PC-DOS / MS-DOS came out about the same time as CP/M-86, and include some compatibility in how the system services can be accessed within a .com program.

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Last modified: 03/11/09