Control Program for Microcomputers
<operating system> (CP/M) An early microcomputer operating system
written by Gary Kildall of Digital Research
and Zilog Z80
-based 8-bit computers.
CP/M was very popular in the late 1970s but was virtually wiped out by MS-DOS
after the release of the IBM PC
Many of CP/M's features and conventions strongly resemble those of early DEC
operating systems such as TOPS-10
, OS/8, RSTS and RSX-11.
CP/M might have been the OS
for the IBM PC
instead of MS-DOS
but Kildall wanted to keep control of his creation and only license it to IBM.
Big Blue however wanted to own and control it completely.
Kildall spent the day IBM's reps wanted to meet him enjoying the perfect flying weather in his private plane.
[Did CP/M use the same FAT
file system as MS-DOS?]