MS-DOS 3.31
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
MS-DOS 3.31 was only sold through a few OEMs, mainly Compaq.
This version adds support for hard drives up to 512MB.
It also does not use as much conventional memory as DOS 4.x or later, making it a good choice for 8088/8086 based computers.
Downloads
| Download name | Version | Language | Architecture | File size | Downloads |
|---|---|---|---|---|---|
 Microsoft MS-DOS 3.31 (3.5-1.44mb) |
3.31 | English |
|
302.39KB | 10 |
|
Microsoft MS-DOS 3.31 [Compaq OEM Rev G] (3.5-720k) |
3.31 [Compaq OEM Rev G] | English |
|
438.86KB | 5 |
|
Microsoft MS-DOS 3.31 [Compaq OEM] (3.5-720k) |
3.31 [Compaq OEM] | English |
|
749.01KB | 3 |
 Microsoft MS-DOS 3.31 [Emerson OEM] (5.25-1.2mb) |
3.31 [Emerson OEM] | English |
|
739.87KB | 0 |
|
Microsoft MS-DOS 3.31 [German] [Compaq OEM] (5.25-360k) |
3.31 [Compaq OEM] | German |
|
466.51KB | 0 |