Discontinued computer operating system for x86 processors
Operating system
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; 39 years ago (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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DOSPlus (erroneously also known as DOS+) was the first operating system developed by Digital Research's OEM Support Group in Newbury, Berkshire, UK,...
(PalmDOS 1.0), "1.2" (DOSPlus 1.2 in DOS emulation), "2.0" (Concurrent DOS 386 2.0), "3.0" (Concurrent DOS 386 3.0), "3.31" (DR DOS 3.31), "3.32" (DR DOS...
DOS/360 from 1966. Others include Apple DOS, Apple ProDOS, Atari DOS, Commodore DOS, TRSDOS, and AmigaDOS. IBM PC DOS (and the separately sold MS-DOS)...
of MS-DOS, IBM PC DOS, and at least partially compatible disk operating systems. It does not include the many other operating systems called "DOS" which...
8-bit, 16-bit and 32-bit systems like MP/M, Concurrent DOS, FlexOS, Multiuser DOS, DOSPlus, DR DOS and GEM. It was the first large software company in the...
Sinclair PC500. Amstrad licensed both MS-DOS 3.2 and Digital Research DOSPlus, which was largely compatible with MS-DOS and included some features from CP/M...
Linux and most other versions of Unix), Mach-O (on macOS and iOS) and MZ (on DOS). Metadata is casually used to describe the controlling data used in software...
family: DOSPlus 1.0, a single-user variant of Concurrent PC DOS in 1985 DOSPlus 1.1, a single-user variant of Concurrent PC DOS in 1985 DOSPlus 1.2, a...
The DOS API is an API which originated with 86-DOS and is used in MS-DOS/PC DOS and other DOS-compatible operating systems. Most calls to the DOS API...
version of Digital Research's DR DOS since 1988 DOSPlus, a ROMable DOS DR DOS, a ROMable DOS PalmDOS, a ROMable DOS This disambiguation page lists articles...
family: DOSPlus 1.0, a single-user variant of Concurrent PC DOS in 1985 DOSPlus 1.1, a single-user variant of Concurrent PC DOS in 1985 DOSPlus 1.2, a...
based on Concurrent CP/M-86 developed by Digital Research DOSPlus (since 1985), a PC DOS and CP/M-86 compatible multitasking operating system for early...
AMSDOS Contiki CP/M 2.2 CP/M Plus SymbOS Apple II family Apple DOS Apple Pascal Apex (Colorado School of Mines) ProDOS GS/OS GNO/ME Contiki Apple III...
Apricot one. These formats were also supported by DOSPlus 2.1e/g for the Apricot ACT series. The DOSPlus adaptation for the BBC Master 512 supported two...
subdirectories. DOSPlus and older issues of DR DOS (up to DR DOS 6.0, with BDOS 6.7 in 1991) had no such limitation due to their implementation using a DOS emulation...
DOS family since Concurrent DOS 4.11, including siblings like DOSPlus and successors. Developed in Hungerford, UK, versions 5 and 6 (Concurrent DOS XM...
IBM DOS 3.3 in 1988 It may also refer to versions of the Digital Research DR DOS family: DR DOS 3.31, based on DOSPlus 2.1 and Concurrent PC DOS 6.0...
technical information about user's software and hardware Diagnostics MS-DOSPlus! 95 for Windows 95 Microsoft System Information Microsoft Fax Faxing app...
AMSDOS DOS family 86-DOS, MS-DOS, PC DOS DR DOS, Novell DOS, PalmDOS, OpenDOS ROM-DOS PTS-DOS, S/DOS FreeDOS PC-MOS/386 SISNE plus GEMDOS, TOS, MiNT, MagiC...
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