EDOS
Encyclopedia
EDOS was an operating system
Operating system
An operating system is a set of programs that manage computer hardware resources and provide common services for application software. The operating system is the most important type of system software in a computer system...

 based upon IBM's original DOS. The name stood for extended (or enhanced) disk operating system.

EDOS

In 1970, IBM
IBM
International Business Machines Corporation or IBM is an American multinational technology and consulting corporation headquartered in Armonk, New York, United States. IBM manufactures and sells computer hardware and software, and it offers infrastructure, hosting and consulting services in areas...

 announced the IBM/370 product line along with new peripherals, software products, and operating systems, including DOS/VS that supplanted DOS
DOS
DOS, short for "Disk Operating System", is an acronym for several closely related operating systems that dominated the IBM PC compatible market between 1981 and 1995, or until about 2000 if one includes the partially DOS-based Microsoft Windows versions 95, 98, and Millennium Edition.Related...

. Although IBM was rightly focused on their new products, the computing world was dominated by the IBM/360 line, which left a lot of users nervous about their investment.

Although there were a couple of projects emulating the IBM/370 on the IBM/360 (e.g., CFS, Inc.), a couple of companies took a different approach, extending the then-current (and limited) DOS.

The Computer Software Company took the latter approach. Starting in 1972, they developed EDOS, Extended Disk Operating System. They extended the number of fixed program space partitions from 3 to 6, added support for new hardware, and included features that IBM had offered separately.

They also made available other third party enhancements such as a spooler and DOCS
DOCS (software)
DOCS, Display Operator Console Support, was a systems software package that provided video display for the IBM/370 running DOS/VS and DOS/VSE environments, and IBM/360 retrofitted with modified DOS, such as TCSC's EDOS.- The product :...

, from CFS, Inc.

TCSC

The Computer Software Company was founded by Jerry Enfield and Tom Steel, responsible for development and marketing, respectively. Company headquarters were in Richmond, Virginia
Richmond, Virginia
Richmond is the capital of the Commonwealth of Virginia, in the United States. It is an independent city and not part of any county. Richmond is the center of the Richmond Metropolitan Statistical Area and the Greater Richmond area...

. TCSC, as it was called, expanded into Canada
Canada
Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

, Australia
Australia
Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

, and Europe
Europe
Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...

. The company was later acquired by Nixdorf
Nixdorf
Nixdorf may refer to any of these companies:*Nixdorf Computer AG, a former Paderborn-based computer company *Siemens Nixdorf, the result of the merger of Nixdorf and Siemens *Wincor Nixdorf, one of the successors of Siemens-Nixdorf....

.
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