DR-DOS (written as DR DOS, without a hyphen, in versions up to and including 6.0) is a disk operating system for IBM PC compatibles. Upon its introduction...

"3.33" (DR DOS 3.33), "3.34" (DR DOS 3.34), "3.35" (DR DOS 3.35), "3.40" (DR DOS 3.40), "3.41" (DR DOS 3.41, EZ-DOS 3.41), "3.41T" (DR DOS 3.41T), "4...

Microsoft's MS-DOS, both of which were introduced in 1981. Later compatible systems from other manufacturers include DR-DOS (1988), ROM-DOS (1989), PTS-DOS (1993)...

MS-DOS compatible systems include: IBM PC DOS DR-DOS, Novell DOS, OpenDOS FreeDOS PTS-DOS ROM-DOS Microsoft made IBM PC DOS for IBM. It and MS-DOS were...

MS-DOS versions 4 and later and DR DOS releases 5.0 and later. On earlier DOS versions the memory usage could be shown by running CHKDSK. In DR DOS the...

Concurrent DOS V60 FlexOS DR DOS PC DOS – IBM's OEM version of (single-user) MS-DOS MS-DOS 4.0 (multitasking) PC-MOS/386 – unrelated multitasking DOS clone...

8-bit, 16-bit and 32-bit systems like MP/M, Concurrent DOS, FlexOS, Multiuser DOS, DOS Plus, DR DOS and GEM. It was the first large software company in the...

subdirectories. DOS Plus and older issues of DR DOS (up to DR DOS 6.0, with BDOS 6.7 in 1991) had no such limitation due to their implementation using a DOS emulation...

of MS-DOS, IBM PC DOS, and at least partially compatible disk operating systems. It does not include the many other operating systems called "DOS" which...

into upper memory (HILOAD in DR DOS). LOCK Enables external programs to perform low-level disk access to a volume. (MS-DOS 7.1 and Windows 9x only)[citation...