CP/M means
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<font lang="en-US"><font style="font-size:" small;=""><font style="font-family:" urw="" bookman="" l;=""><font style="color:" #000000;="">Computing Program for Microcomputers</font></font></font></font>
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<font lang="en-US"><font style="font-size:" small;=""><font style="font-family:" urw="" bookman="" l;=""><font style="color:" #000000;="">Computing Peripheral for Microcomputers</font></font></font></font>
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<font lang="en-US"><font style="font-size:" small;=""><font style="font-family:" urw="" bookman="" l;=""><font style="color:" #000000;="">Control Program for Microcomputers</font></font></font></font>
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<font lang="en-US"><font style="font-size:" small;=""><font style="font-family:" urw="" bookman="" l;=""><font style="color:" #000000;="">Control Peripheral for Microcomputers</font></font></font></font>
CP/M (Control Program for Microcomputers) was an early operating system for microcomputers, created by Gary Kildall. It was a control program, not about computing or peripherals. CP/M influenced the design of DOS and was widely used in the late 1970s and early 1980s.