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DOS (/ d ɒ s /, / d ɔː s /) is a family of disk-based operating systems for IBM PC compatible computers. [1] The DOS family primarily consists of IBM PC DOS and a rebranded version, Microsoft's MS-DOS, both of which were introduced in 1981.
The IBM PC/AT, a computer built around the 6-MHz Intel 80286 microprocessor, with a 16-bit ISA bus, new CMOS clock and 20 MB hard drive, is introduced. It ships with PC DOS 3.0, which adds support for quadruple, or high density (80-track), 15 sectors per track 1.2 MB (1,228,800 bytes; 2,400 sectors) floppy disks. Their FAT fills seven sectors ...
As MS-DOS 7.0 was a part of Windows 95, support for it also ended when Windows 95 extended support ended on December 31, 2001. [84] As MS-DOS 7.10 and MS-DOS 8.0 were part of Windows 98 and Windows ME, respectively, support ended when Windows 98 and ME extended support ended on July 11, 2006, thus ending support and updates of MS-DOS from ...
DOS/VSE was introduced in 1979 as an "extended" version of DOS/VS to support the new 4300 processors. [11] The 4300 systems included a feature called ECPS:VSE that provided a single-level storage for both the processor and the I/O channels. [12] DOS/VSE provided support for ECPS:VSE, but could also run on a System/370 without that feature.
Originally MS-DOS was designed to be an operating system that could run on any computer with a 8086-family microprocessor.It competed with other operating systems written for such computers, such as CP/M-86 and UCSD Pascal.
1951 LEO I 'Lyons Electronic Office' [1] was the commercial development of EDSAC computing platform, supported by British firm J. Lyons and Co.; 1953 DYSEAC - an early machine capable of distributing computing
The Social Security Administration introduced cost-of-living adjustments (COLAs) in 1975 to help benefits maintain their buying power amid rising inflation. In fact, since 2010, Social Security ...
86-DOS (a.k.a. QDOS, created 1980), an operating system developed by Seattle Computer Products for its 8086-based S-100 computer kit, heavily inspired by CP/M; Concurrent DOS (a.k.a. CDOS, Concurrent PC DOS and CPCDOS) (since 1983), a CP/M-86 and MS-DOS 2.11 compatible multiuser, multitasking DOS, based on Concurrent CP/M-86 developed by Digital Research