DOS Plus (erroneously also known as DOS+) is an operating system written by Digital Research, first released in 1985. It can be seen as an intermediate step between CP/M-86 and DR-DOS.
It 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 these systems. Up to four CP/M-86 programs can be multitasked, but only one DOS program can be run at a time.
Read more about DOS Plus: User Interface, Commands, Internal Structure, Computers That Used DOS Plus
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“Remember that it’s never a crime in the face of humanity and enlightenment to distribute the works of the great humanists among the merchants and moneychangers of this godforsaken country... You better slip me the dough.”
—John Dos Passos (1896–1970)