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 DOS 3.21 (5.25-360k) 3.21 English x86 5¼ Floppy 1.14MB
Microsoft DOS 3.21 [Commodore OEM] (5.25-360k) 3.21 [Commodore OEM] English x86 5¼ Floppy 119.91KB
Microsoft DOS 3.21 [Hyosung OEM] (5.25-360k) 3.21 [Hyosung OEM] English x86 5¼ Floppy 135.8KB
Microsoft DOS 3.21 [KayPro OEM] (5.25-360k) 3.21 [KayPro OEM] English x86 5¼ Floppy 273.47KB
Microsoft DOS 3.21 [TeleVideo Systems OEM] (5.25-360k) 3.21 [TeleVideo Systems OEM] English x86 5¼ Floppy 405.87KB
Microsoft DOS 3.21 [Zenith Z100 PC] (5.25-360k) 3.21 [Zenith Z100 PC] English x86 5¼ Floppy 232.36KB

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