CP/M

CP/M

In 1974, Dr. Gary A. Kildall, while working for Intel Corporation, created CP/M (Control Programs for Microcomputers) as the first operating system for the new microprocessor. By 1977, CP/M had become the most popular operating system (OS) in the fledgling microcomputer (PC) industry. In 1981, Microsoft paid Seattle Software Works for a clone of CP/M, and Microsoft licensed this clone to IBM which marketed it as PC-DOS on the first IBM PC in 1981, and Microsoft marketed it to all other PC OEMs as MS-DOS.

Exey Panteleev | CC BY 2.0