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.
Downloads
| Download name | Version | Language | Architecture | File size | Downloads |
|---|---|---|---|---|---|
 Microsoft MS-DOS 3.21 (5.25-360k) |
3.21 | English |
|
1.14MB | 2 |
|
Microsoft MS-DOS 3.21 [Atari OEM] [Spanish] (5.25-360k) |
3.21 [Atari OEM] | English |
|
128.38KB | 0 |
|
Microsoft MS-DOS 3.21 [Commodore OEM] (5.25-360k) |
3.21 [Commodore OEM] | English |
|
119.91KB | 1 |
|
Microsoft MS-DOS 3.21 [Commodore OEM] (5.25-360k) |
3.21 [Commodore OEM] | English |
|
219.44KB | 1 |
|
Microsoft MS-DOS 3.21 [Hyosung OEM] (5.25-360k) |
3.21 [Hyosung OEM] | English |
|
135.8KB | 0 |
|
Microsoft MS-DOS 3.21 [KayPro OEM] (5.25-360k) |
3.21 [KayPro OEM] | English |
|
273.47KB | 0 |
|
Microsoft MS-DOS 3.21 [TeleVideo Systems OEM] (5.25-360k) |
3.21 [TeleVideo Systems OEM] | English |
|
405.87KB | 0 |
|
Microsoft MS-DOS 3.21 [Wyse OEM r1.03] (5.25-360k) |
3.21 [Wyse OEM r1.03] | English |
|
3.47MB | 0 |
 Microsoft MS-DOS 3.21 [Zenith OEM] (3.5-720k) |
3.21 [Zenith OEM] | English |
|
2.11MB | 0 |
|
Microsoft MS-DOS 3.21 [Zenith Z100 PC] (5.25-360k) |
3.21 [Zenith Z100 PC] | English |
|
232.36KB | 0 |