DOS Plus

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.

^ ^a ^b ^c Cite error: The named reference Wein_2009_DOSPLUS was invoked but never defined (see the help page).

[Wein_2009_DOSPLUS-1] Cite error: The named reference Wein_2009_DOSPLUS was invoked but never defined (see the help page).

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