Later, a accumulation of Microsoft programmers (primarily Paul Allen, Mark Zbikowski and Aaron Reynolds)2 began assignment on PC DOS 2.0. Absolutely rewritten from the arena up, DOS 2.0 added subdirectories and adamantine deejay abutment for the fresh IBM XT, which debuted in March 1983. A fresh 9-sector architecture bumped the accommodation of billowing disks to 360k. The Unix-inspired atom featured book handles in abode of the CP/M-derivative book ascendancy blocks and loadable accessory drivers could now be acclimated for abacus accouterments above what the IBM PC BIOS supported. BASIC and best of the utilities provided with DOS were essentially upgraded as well. A above adventure that took about 10 months of work, DOS 2.0 was added than alert as big as DOS 1.x, application about 28k of RAM compared to the 12k of its predecessor. It would anatomy the base for all customer Microsoft OSes until 2001.2
The afterward October, DOS 2.1 debuted. Predictably a accessory upgrade, it anchored some bugs and added abutment for bisected acme billowing drives and the fresh IBM PCjr.
In 1983, newly-founded Compaq appear the aboriginal 100% IBM PC accordant carbon and accountant their own OEM adaptation of DOS 1.10 (quickly replaced by DOS 2.00) from Microsoft. Other PC clones followed suit, best of which included hardware-specific DOS features, but some were absolutely generic.
The afterward October, DOS 2.1 debuted. Predictably a accessory upgrade, it anchored some bugs and added abutment for bisected acme billowing drives and the fresh IBM PCjr.
In 1983, newly-founded Compaq appear the aboriginal 100% IBM PC accordant carbon and accountant their own OEM adaptation of DOS 1.10 (quickly replaced by DOS 2.00) from Microsoft. Other PC clones followed suit, best of which included hardware-specific DOS features, but some were absolutely generic.
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