DOS 1 or DOS-1 may refer to: * The Soviet space station Salyut 1, also called DOS-1 It may also refer to versions of Seattle Computer Product's 86-DOS (the predecessor to MS-DOS and PC DOS): *

86-DOS 1.00 86-DOS (known internally as QDOS, for Quick and Dirty Operating System) is a discontinued operating system developed and marketed by Seattle Computer Products (SCP) for its Intel 8086-based computer kit. 86-DOS shared a few of its commands wit ...

, SCP OEM released version on 28 April 1981, licensed to OEMs including Microsoft * 86-DOS 1.01, SCP internal version in May 1981 * 86-DOS 1.10, SCP OEM released version in July 1981, sold to Microsoft and renamed to MS-DOS *

86-DOS 1.14 86-DOS (known internally as QDOS, for Quick and Dirty Operating System) is a discontinued operating system developed and marketed by Seattle Computer Products (SCP) for its Intel 8086-based computer kit. 86-DOS shared a few of its commands wit ...

, basis for IBM Personal Computer DOS 1.0 It may also refer to versions of the Microsoft MS-DOS family: * MS-DOS 1.11, Microsoft internal version in 1981 * MS-DOS 1.12, Microsoft internal version in 1981 * MS-DOS 1.13, Microsoft internal version in 1981 * MS-DOS 1.20, Microsoft internal version in 1981 * MS-DOS 1.21, Microsoft internal version in 1982 * MS-DOS 1.22, Microsoft internal version in 1982 * MS-DOS 1.23, Microsoft internal version in 1982 * MS-DOS 1.24, Microsoft internal version in 1982, basis for IBM Personal Computer DOS 1.1 *

MS-DOS 1.25 MS-DOS ( ; acronym for Microsoft Disk Operating System, also known as Microsoft DOS) is an operating system for x86-based personal computers mostly developed by Microsoft. Collectively, MS-DOS, its rebranding as IBM PC DOS, and a few ope ...

, basis for OEM versions of MS-DOS other than IBM in 1982, including

SCP MS-DOS 1.25 86-DOS (known internally as QDOS, for Quick and Dirty Operating System) is a discontinued operating system developed and marketed by Seattle Computer Products (SCP) for its Intel 8086-based computer kit. 86-DOS shared a few of its commands w ...

* MS-DOS 1.26, Microsoft internal version in 1982 * MS-DOS 1.27, Microsoft internal version in 1982 * MS-DOS 1.28, Microsoft internal version in 1982 * MS-DOS 1.29, Microsoft internal version in 1982 * MS-DOS 1.30, Microsoft internal version in 1982 * MS-DOS 1.40, Microsoft internal version in 1982 * MS-DOS 1.41, Microsoft internal version in 1982 * MS-DOS 1.50, Microsoft internal version in 1982 * MS-DOS 1.51, Microsoft internal version in 1982 * MS-DOS 1.52, Microsoft internal version in 1982 * MS-DOS 1.53, Microsoft internal version in 1982 * MS-DOS 1.54, Microsoft internal version in 1982 It may also refer to versions of the IBM Personal Computer DOS family: * IBM Personal Computer DOS 1.0, OEM version of 86-DOS 1.14 in 1981 * IBM Personal Computer DOS 1.1, OEM version of MS-DOS 1.24 in 1982 It may also refer to versions of the Digital Research operating system family: * DOS Plus 1.0, a single-user variant of Concurrent PC DOS in 1985 * DOS Plus 1.1, a single-user variant of Concurrent PC DOS in 1985 *

DOS Plus 1.2 DOS Plus (erroneously also known as DOS+) was the first operating system developed by Digital Research's OEM Support Group in Newbury, Berkshire, UK, first released in 1985. DOS Plus 1.0 was based on CP/M-86 Plus combined with the PCMODE e ...

, a single-user variant of Concurrent PC DOS 4.1 in 1986 * PalmDOS 1.0, a Novell successor to Digital Research's DR DOS 6.0 tailored for early palmtop PCs It may also refer to versions of the FreeDOS operating system: * FreeDOS 1.0, a free and open-source DOS 7.1-compatible operating system distributed since September 2006 * FreeDOS 1.1, a successor released in January 2012 * FreeDOS 1.2, a successor released in December 2016

See also