Resources - Operating Systems - Disk Operating System (DOS)

The Disk Operating System (DOS) is a major staple in computing history.  A number of vendors promoted their own variants of it, and although most have either moved on to GUI-based technologies or abandoned it completely, there are still many DOS users and developers today.

DR-DOS
http://www.drdos.com/

Originally introduced to the market as "Digital Research DOS," DR-DOS is an embedded DOS system, designed for straight-forward out-of-the-box implementation into ROM or Flash ROM.

FreeDOS
http://www.freedos.org/

FreeDOS is a free DOS-compatible operating system for IBM-PC compatible systems.  FreeDOS is made of up many different, separate programs that act as "packages" to the overall FreeDOS Project.

IBM PC-DOS
http://www-01.ibm.com/software/awdtools/rexx/library/rexxdos.html

IBM PC-DOS is a DOS operating system for the IBM Personal Computer, sold mainly throughout the 1980s and 1990s.  The original 1981 arrangement between IBM and Microsoft was that Microsoft would provide the base product and that both firms would work on developing different parts of it into a more powerful and robust system, and then share the resultant code.

Microsoft MS-DOS
http://www.microsoft.com/products/dos/

Commercialized by Microsoft, MS-DOS became the most commonly used member of the DOS family of operating systems and was the main operating system for computers during the 1980s.

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