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Lexikon

MS-DOS

/M S doss/ Microsoft Disk Operating System (Or "href="module.php?name=Lexikon&file=search&eid=1&query=DOS">DOS", "href="module.php?name=Lexikon&file=search&eid=1&query=MS-DOG">MS-DOG", "href="module.php?name=Lexikon&file=search&eid=1&query=mess-dos">mess-dos") {Microsoft Corporation}' s {clone} of {CP/M} for the {8088} crufted together in 6 weeks by hacker Tim Paterson, who is said to have regretted it ever since. MS-DOS is a single user href="module.php?name=Lexikon&file=search&eid=1&query=operating system">operating system that runs one program at a time and is limited to working with one megabyte of memory, 640 kilobytes of which is usable for the href="module.php?name=Lexikon&file=search&eid=1&query=application program">application program. Special add-on href="module.php?name=Lexikon&file=search&eid=1&query=EMS">EMS memory boards allow EMS-compliant software to exceed the 1 MB limit. Add-ons to DOS, such as href="module.php?name=Lexikon&file=search&eid=1&query=Microsoft Windows">Microsoft Windows and href="module.php?name=Lexikon&file=search&eid=1&query=DESQview">DESQview, take advantage of EMS and allow the user to have multiple applications loaded at once and switch between them. Numerous features, including vaguely href="module.php?name=Lexikon&file=search&eid=1&query=Unix">Unix-like but rather broken support for subdirectories, href="module.php?name=Lexikon&file=search&eid=1&query=I/O redirection">I/O redirection, and href="module.php?name=Lexikon&file=search&eid=1&query=pipelines">pipelines, were hacked into MS-DOS 2.0 and subsequent versions as a result, there are two or more incompatible versions of many system calls, and MS-DOS programmers can never agree on basic things like what character to use as an option switch or whether to be case-sensitive. The resulting mess is now the highest-unit-volume href="module.php?name=Lexikon&file=search&eid=1&query=operating system">operating system in history. It is used on many href="module.php?name=Lexikon&file=search&eid=1&query=Intel">Intel 16 and 32 bit href="module.php?name=Lexikon&file=search&eid=1&query=microprocessors">microprocessors and href="module.php?name=Lexikon&file=search&eid=1&query=IBM PC">IBM PC compatibles. Many of the original DOS functions were calls to href="module.php?name=Lexikon&file=search&eid=1&query=BASIC">BASIC (in href="module.php?name=Lexikon&file=search&eid=1&query=ROM">ROM on the original href="module.php?name=Lexikon&file=search&eid=1&query=IBM PC">IBM PC), e.g. Format and Mode. People with non-IBM PCs had to buy href="module.php?name=Lexikon&file=search&eid=1&query=MS-Basic">MS-Basic (later called href="module.php?name=Lexikon&file=search&eid=1&query=GWBasic">GWBasic). Most version of DOS came with some version of BASIC. Also know as PC-DOS or simply as DOS, which annoys people familiar with other similarly abbreviated operating systems (the name goes back to the mid-1960s, when it was attached to href="module.php?name=Lexikon&file=search&eid=1&query=IBM">IBM' s first disk operating system for the href="module.php?name=Lexikon&file=search&eid=1&query=IBM 360">IBM 360). Some people like to pronounce DOS like "dose" or to compare it to a dose of brain-damaging drugs (a slogan button in wide circulation among hackers exhorts: "MS-DOS: Just say No!"). [href="module.php?name=Lexikon&file=search&eid=1&query=Jargon File">Jargon File] (1998-07-19)

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