DR DOS 3.x
DR DOS is an MS-DOS compatible operating system from Digital Research that evolved from their earlier CP/M-86 based products Concurrent DOS and DOS Plus.
DR DOS was compatible with most PC/MS-DOS software, including Windows 3.1, disk utilities, debuggers, networking software, and TSRs.
Version 5 was especially successful as it beat Microsoft to the market with the ability to free up more of the 640k base memory, something that was badly needed at the time.
Later versions included even more powerful features, including a graphical shell called ViewMAX based on Digital Research GEM, disk caching, LapLink style file serial/parallel transfer, power management, built in help, an undelete tool, SuperStor disk compression, and a task switcher.
Over all, it was considered a very good product, and it appealed to power users.
DR DOS also played a key roll in giving computer manufactures leverage against Microsoft.
Release notes
DR DOS was initially introduced as an OEM-only product designed to address shortcomings of MS-DOS. Although it was based on Concurrent DOS 6.0, all multi-user and multitasking ability was stripped out.
The first DR DOS release was numbered "3.31" to show it was on par with the latest shipping MS-DOS, Compaq DOS 3.31. DR DOS also included large partition (larger than 32MB) support.
DR DOS offered some extended command line tools with command line help, verbose error messages, sophisticated command line history and editing as well as support for file and directory passwords built right into the kernel. It was also cheaper to license than MS-DOS.
Wanted: Complete OEM releases of DR DOS 3.31, DR DOS 3.32, DR DOS 3.33, DR-DOS 3.34
Downloads
| Download name | Version | Language | Architecture | File size | Downloads |
|---|---|---|---|---|---|
 Digital Research DR DOS 3.35 (2001 Sales OEM EZ-DOS 3.35) (1988) (5.25-360k) |
3.35 (2001 Sales OEM EZ-DOS 3.35) | English |
|
3.79MB | 0 |
|
Digital Research DR DOS 3.40 (1989) (5.25-360k) |
3.40 | English |
|
3.71MB | 0 |
|
Digital Research DR DOS 3.40 (2001 Sales OEM EZ-DOS 3.40) (1989) (5.25-360k) |
3.40 (2001 Sales OEM EZ-DOS 3.40) | English |
|
6.19MB | 1 |
|
Digital Research DR DOS 3.41 (5.25) |
3.41 | English |
|
226.15KB | 1 |
 Digital Research DR DOS 3.41 (Acorn OEM) (1989) (3.5-720k) |
3.41 (Acorn OEM) | English |
|
1.15MB | 0 |