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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“The mind cannot support moral chaos for long. Men are under as strong a compulsion to invent an ethical setting for their behavior as spiders are to weave themselves webs.”
—John Dos Passos (1896–1970)