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IBM PC-DOS was an IBM branded version of MS-DOS licensed from Microsoft for use on the IBM PC system. Versions of PC-DOS paralleled that of MS-DOS up ...

Multitasking "MS-DOS 4.00" is a developmental version of MS-DOS that was never released to retail consumers. It was eventually licensed to some compan ...

Multi-Programming Monitor Control Program (MP/M) was a multi-user version of CP/M created in 1979. It could run on 8080 or Z80 based computers. Eventu ...

HP-UX is a Unix variant based off of System III, later System V Unix. Released in 1984, the initial version of HP-UX supported the Motorola 68k proces ...

GEM is a graphical application environment that runs on top of MS/PC-DOS. It was built on the technology of Digital Research's GSX portable runtime (U ...

DR DOS was initially introduced as an OEM-only product designed to address shortcomings of MS-DOS. Although it was based on Concurrent DOS 6.0, all mu ...

Digital Research's DOS Plus was an intermediate product between CP/M-86 and DR-DOS. It can run both CP/M-86 and MS-DOS programs, and read both disk fo ...

CP/M-80, from Digital Research, was a popular operating system for 8080 and Z80 microcomputers. Each release was customized by OEMs specifically for t ...

CP/M-86 is a port of Digital Research's CP/M operating system to the Intel 8088/8086. The earlier CP/M-80 was extremely popular on 8080/Z80 microcompu ...

Originally an optional module for Concurrent CP/M-86 3.1, this version of Digital Research's CP/M provided basic compatibility with PC-DOS in 1983. Si ...

Concurrent CPM-86 is a multitasking version of CP/M that evolved from Digital Researches' earlier multitasking MP/M product. A seperate add-on was ava ...

First released in 2002, Breadbox Ensemble from Breadbox Computer Company, was a commercial office application suite for DOS that was based on GEOS/Geo ...