MS-DOS version 2.xx

In early 1983, IBM launched the IBM PC XT (Extended Technology), as an improvement from the 5150 version of the IBM PC. IBM PC XT is equipped with a 10M hard disk, the interface input / output serial type (RS-232 or better known as the COM interface), with a capacity of 128K RAM, a floppy disk drive 360K double-side and three expansion slots. Of course, the use of some new hardware such as hard disks, floppy drives and a capacity of 360K (40K higher than the double-side version of the IBM PC in 5150) requires an operating system, IBM and Microsoft does not disappoint. They readily and quickly released the MS-DOS version 2.0. Finally, the IBM PC XT is bundled with the IBM PC-DOS 2.0.

MS-DOS version 2.0 has many improvements from MS-DOS 1.1, IBM PC computers intended for 5150. Among these is support for the use of a hierarchical directory structure (branched) like a tree whose root (root) and branches (branch). In addition, the MS-DOS 2.0 also supports a variety of functions adopted from UNIX, as well as the use of I / O redirection (>,>>, <, <<) and the print spooler. Features the print spooler is a feature that can save the file to be printed in a buffer memory so that the file will not be printed directly printed, but saved first. The aim is that the printing process can take place more quickly, and users should not be bothered to print the entire file if the paper runs out, but just need a new paper and pressing the reset button to continue. While I / O redirection function to perform input and output functions performed from the command line. Besides the two features adopted from UNIX, DOS version 2.0 also allows you to install drivers for DOS, by integrating it in the configuration file config.sys.

Apparently, the IBM PC XT computer was very successful: his success even reached Japan. To support Japanese Kanji language, Microsoft decided to launch the MS-DOS version of 2:05.

In the same year, IBM launched the IBM PC Jr.. (Read: PC Junior). Unfortunately, unlike his brothers, the IBM PC Jr.. failed in the market. When launched, the IBM PC Jr.. using IBM PC-DOS 2.1.

Source :http://id.wikipedia.org/wiki/MS-DOS#MS-DOS_versi_2.xx

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