Software for computer systems with disk drives which supervises and controls the running of programs. The operating system is ‘booted’ into the computer from disk by a small program which permanently resides in the memory. Commom operating systems include ms-dos, pc-dos (ibm’s version of ms-dos), cp/m (an operating system for older, 8-bit computers), unix and bos. –and macos, for macintosh computers.
