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DOS Plus
 Digital Research DOS Plus Version 1.2 | |
| Developer | Digital Research |
|---|---|
| OS family | CP/M-86 |
| Working state | Discontinued |
| Source model | Closed source |
| Initial release | 1985 |
| Latest release | DOS Plus 2.1 (with BDOS 5.0) |
| Available in | English |
| Platforms | Intel 8086, Intel 80186 |
| Kernel type | Monolithic kernel |
| Default user interface | Command-line interface (COMMAND.COM) |
| License | Proprietary |
| Preceded by | CP/M-86 Plus |
| Succeeded by | DR DOS |
DOS Plus (erroneously also known as DOS+) was the first operating system developed by Digital Research's OEM Support Group[1] in Newbury, Berkshire, UK, first released in 1985. DOS Plus 1.0 was based on CP/M-86 Plus combined with the PCMODE emulator from Concurrent PC DOS 4.11.[1] While CP/M-86 Plus and Concurrent DOS 4.1 still had been developed in the United States, Concurrent PC DOS 4.11 was an internationalized and bug-fixed version brought forward by Digital Research UK.[1] Later DOS Plus 2.x issues were based on Concurrent PC DOS 5.0 instead. In the broader picture, DOS Plus can be seen as an intermediate step between Concurrent CP/M-86 and DR DOS.
DOS Plus is able to run programs written for either CP/M-86 or MS-DOS 2.11, and can read and write the floppy formats used by both of these systems. Up to four CP/M-86 programs can be multitasked, but only one DOS program can be run at a time.
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