1. Mircosoft Dos and Unix
The earliest forms of DOS were crude and utilized only a few commands, but as computers became more advanced, so did DOS. ... It came with a new variant of MS-DOS, Version 2.0. ... Other variations of MS-DOS exist, such as PC-DOS by IBM, DOS-V, Dr. DOS and others. There is even a FREE DOS available on the Internet as an MS-DOS clone. ...
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