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 people of the United States have been fortunate in many things. One of the things in which we have been most fortunate has been that so far, due perhaps to certain basic virtues in our traditional ways of doing things, we have managed to keep the crisis of western civilization, which has devastated the rest of the world and in which we are as much involved as anybody, more or less at arm’s length.”
—John Dos Passos (1896–1970)