DOS commonly refers to the family of closely related operating systems which dominated the IBM PC compatible market between 1981 and 1995 (or until about 2000, if Windows versions 95 and 98 are included) : PC-DOS, MS-DOS, FreeDOS, DR-DOS, Novell-DOS, OpenDOS, PTS-DOS, ROM-DOS and several others. Of these, MS-DOS from Microsoft was the most widely used. These operating systems ran on IBM PC type hardware using the Intel x86 CPUs or their compatible cousins from other makers. MS-DOS is still common today and was the foundation for many of Microsoft's operating systems (from Windows V1.00 through Windows Me). MS-DOS was later abandoned as the foundation for their operating systems.
It was first developed at Seattle Computer Products by Tim Patterson as a variant of CP/M-80 from Digital Research, but intended as an internal product for testing SCP's new 8086 CPU card for the S-100 bus. It did not run on the 8080 (or compatible) CPU needed for CP/M-80. It was called QDOS, among several other names. Microsoft licensed it from SCP, made changes and licensed the result to IBM (sold as PC-DOS) for its new 'PC' using the 8088 CPU (internally the same as the 8086), and to many other hardware manufacturers. In the later case it was sold as MS-DOS.
More on [ DOS ]
DOS Friendly :: Tiny
Monolithic :: Operating Systems

Doctor DOS Betamax Power-Users' Corner - Commentary, tutorials, and references for MS-DOS and related utilities.
Dos/Windows commands since v1.00 - An index of all built-in commands available in all versions of MS-DOS. Includes description and syntax of commands.
Georgos the DOS compatible operating system - A free DOS-compatible operating system. Site includes sample applications, discussion forum, and development information.
IBM Corp. - Makes PC DOS 2000; was one of the two original DOSes for the IBM PC. Now year 2000 compliant, and updated for a new century. Preserve your investment in DOS applications.
Meta Description: [ All IBM Software Products listed alphabetically that start with A ]
Idiots Operating System - A floppy-disk based operating systems distribution with a focus on multimedia applications.
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Paul Edwards's Programming Page - Contains PDOS, a public domain DOS alternative.
PC DOS for Embedded Devices - Retooling of IBM PC DOS for use in embedded systems.
Meta Description: [ All IBM Software Products listed alphabetically that start with A ]
PhysTechSoft Ltd. - Makes PTS-DOS 2000: network support, file manager, archiver, internal boot virus protection, graphical web browser; email, telnet, FTP clients; many utilities, some for embedded system development.
Meta Description: [ PhysTechSoft www-site ]
RealDOS - A barebones DOS alternative.
RMF-DOS - Reduced Memory Footprint; goals: match functions of MS-DOS 6.22, IBM PC DOS 7.00, DR-DOS 7 subset. Written mainly in 2 free C compilers and assembler, most parts are smaller uncompressed than compressed parts of MS, IBM, DR. [Open Source, BSD]
Meta Description: [ The world's largest development and download repository of Open Source code and applications ]
The unofficial PTS-DOS FAQ - In German and in English language. Also wiki, downloads, and links.
Meta Description: [ here you can download the PTS-DOS FAQ in German and in English language (but the english version is really old, sorry) ]
Turkish Rational DOS - The core of DOS compatible operating system that is currently under development.
ZDOS - A 32-bit multitasking, real time replacement for MS-DOS.
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