MS-DOS 3.21

Originally 86-DOS, written by Tim Paterson of Seattle Computer Products, DOS was a rough clone of CP/M for 8086 based hardware. Microsoft purchased it and licensed it to IBM for use with Microsoft's IBM PC language products. In 1982, Microsoft began licensing DOS to other OEMs that ported it to their custom x86 hardware and IBM PC clones.

For IBM-specific releases, please see the IBM PC-DOS product page.



Release notes

Although a minor update, 3.21 was sold with a large number of OEM machines.

DOS 3.21 primarily fixes small bugs, and adds support for IBM Enhanced/IBM Convertible keyboards.

Product type
OS
Vendor
Microsoft
Release date
1987
Minimum CPU
8088
User interface
Text
Platform
DOS
Download count
1351 (21 for release)

Downloads

Download name Version Language Architecture File size Downloads
Microsoft MS-DOS 3.21 (5.25-360k) 3.21 English 1.14MB 5
Microsoft MS-DOS 3.21 [Atari OEM] [Spanish] (5.25-360k) 3.21 [Atari OEM] English 128.38KB 3
Microsoft MS-DOS 3.21 [Commodore OEM] (5.25-360k) 3.21 [Commodore OEM] English 119.91KB 3
Microsoft MS-DOS 3.21 [Commodore OEM] (5.25-360k) 3.21 [Commodore OEM] English 219.44KB 2
Microsoft MS-DOS 3.21 [Hyosung OEM] (5.25-360k) 3.21 [Hyosung OEM] English 135.8KB 2
Microsoft MS-DOS 3.21 [KayPro OEM] (5.25-360k) 3.21 [KayPro OEM] English 273.47KB 2
Microsoft MS-DOS 3.21 [TeleVideo Systems OEM] (5.25-360k) 3.21 [TeleVideo Systems OEM] English 405.87KB 2
Microsoft MS-DOS 3.21 [Zenith Z100 PC] (5.25-360k) 3.21 [Zenith Z100 PC] English 232.36KB 2

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