CP/M (Control Program for Microcomputers) OS
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CP/M: The Foundation of Microcomputer Operating Systems
Created in 1974 by Gary Kildall, CP/M (Control Program for Microcomputers) served as the pioneering mass-market operating system for early 8-bit microcomputers. It established a standardized hardware abstraction layer through its BIOS and BDOS components, which allowed software to run on diverse machines from different manufacturers. This portability fostered a massive software library, including early industry staples like WordStar and dBase. Although it was eventually overtaken by MS-DOS following the launch of the IBM PC, many of its conventions, such as drive letters and file extensions, remain foundational to modern computing. Today, the legacy of Digital Research continues through open-source access to its original code and dedicated hobbyist communities.