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.

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

Downloads

Download Name Version Language CPU File type File size
Microsoft MS-DOS 3.21 (5.25-360k) 3.21 English x86 5¼ Floppy 1.14MB
Microsoft MS-DOS 3.21 [Atari OEM] [Spanish] (5.25-360k) 3.21 [Atari OEM] English x86 5¼ Floppy 128.38KB
Microsoft MS-DOS 3.21 [Commodore OEM] (5.25-360k) 3.21 [Commodore OEM] English x86 5¼ Floppy 119.91KB
Microsoft MS-DOS 3.21 [Commodore OEM] (5.25-360k) 3.21 [Commodore OEM] English x86 5¼ Floppy 219.44KB
Microsoft MS-DOS 3.21 [Hyosung OEM] (5.25-360k) 3.21 [Hyosung OEM] English x86 5¼ Floppy 135.8KB
Microsoft MS-DOS 3.21 [KayPro OEM] (5.25-360k) 3.21 [KayPro OEM] English x86 5¼ Floppy 273.47KB
Microsoft MS-DOS 3.21 [TeleVideo Systems OEM] (5.25-360k) 3.21 [TeleVideo Systems OEM] English x86 5¼ Floppy 405.87KB
Microsoft MS-DOS 3.21 [Zenith Z100 PC] (5.25-360k) 3.21 [Zenith Z100 PC] English x86 5¼ Floppy 232.36KB

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