Editing List of operating systems (section)

==Disk operating systems (DOS)==
{{Main|Disk operating system}}
* [[86-DOS]] (developed at Seattle Computer Products by Tim Paterson for the new Intel 808x CPUs; licensed to [[Microsoft]], became PC DOS/MS-DOS. Also known by its working title QDOS.)
** [[IBM PC DOS|PC DOS]] (IBM's DOS variant, developed jointly with Microsoft, versions 1.0–7.0, 2000, 7.10)
** [[MS-DOS]] (Microsoft's DOS variant for OEM, developed jointly with IBM, versions 1.x–6.22 Microsoft's now abandoned DOS variant)
* [[Concurrent CP/M-86]] 3.1 (BDOS 3.1) with [[PC-MODE]] (Digital Research's successor of [[CP/M-86]] and [[MP/M-86]])
** [[Concurrent DOS]] 3.1-4.1 (BDOS 3.1-4.1)
*** [[Concurrent PC DOS]] 3.2 (BDOS 3.2) (Concurrent DOS variant for IBM compatible PCs)
**** [[DOS Plus]] 1.1, 1.2 (BDOS 4.1), 2.1 (BDOS 5.0) (single-user, multi-tasking system derived from Concurrent DOS 4.1-5.0)
*** [[Concurrent DOS 8-16]] (dual-processor variant of Concurrent DOS for 8086 and 8080 CPUs)
*** [[Concurrent DOS 286]] 1.x
**** [[FlexOS]] 1.00-2.34 (derivative of Concurrent DOS 286)
***** [[FlexOS 186]] (variant of FlexOS for terminals)
***** [[FlexOS 286]] (variant of FlexOS for hosts)
****** [[Siemens S5-DOS/MT]] (industrial control system based on FlexOS)
****** [[IBM 4680 OS]] ([[point of sale|POS]] operating system based on FlexOS)
****** [[IBM 4690 OS]] (POS operating system based on FlexOS)
******* [[Toshiba 4690 OS]] (POS operating system based on IBM 4690 OS and FlexOS)
***** [[FlexOS 386]] (later variant of FlexOS for hosts)
****** [[IBM 4690 OS]] (POS operating system based on FlexOS)
******* [[Toshiba 4690 OS]] (POS operating system based on IBM 4690 OS and FlexOS)
*** [[Concurrent DOS 386]] 1.0, 1.1, 2.0, 3.0 (BDOS 5.0-6.2)
**** [[Concurrent DOS 386/MGE]] (Concurrent DOS 386 variant with advanced graphics terminal capabilities)
**** [[Multiuser DOS]] 5.0, 5.01, 5.1 (BDOS 6.3-6.6) (successor of Concurrent DOS 386)
***** [[CCI Multiuser DOS]] 5.0-7.22 (up to BDOS 6.6<!-- at least for 7.22 -->)
***** [[Datapac Multiuser DOS]]
****** [[Datapac System Manager]] 7 (derivative of Datapac Multiuser DOS)
***** [[IMS Multiuser DOS]] 5.1, 7.0, 7.1 (BDOS 6.6-6.7)
****** IMS [[REAL/32]] 7.50, 7.51, 7.52, 7.53, 7.54, 7.60, 7.61, 7.62, 7.63, 7.70, 7.71, 7.72, 7.73, 7.74, 7.80, 7.81, 7.82, 7.83, 7.90, 7.91, 7.92, 7.93, 7.94, 7.95 (BDOS 6.8 and higher) (derivative of Multiuser DOS)
******* IMS [[REAL/NG]] (successor of REAL/32)
*** [[Concurrent DOS XM]] 5.0, 5.2, 6.0, 6.2 (BDOS 5.0-6.2) (real-mode variant of Concurrent DOS with EEMS support)
**** [[DR-DOS]] 3.31, 3.32, 3.33, 3.34, 3.35, 5.0, 6.0 (BDOS 6.0-7.1) single-user, single-tasking native DOS derived from Concurrent DOS 6.0)
***** Novell [[PalmDOS]] 1 (BDOS 7.0)
***** Novell [[DR DOS "StarTrek"]]
***** [[Novell DOS]] 7 (single-user, multi-tasking system derived from DR DOS, BDOS 7.2)
****** Novell DOS 7 updates 1-10 (BDOS 7.2)
******* Caldera [[OpenDOS]] 7.01 (BDOS 7.2)
******** Enhanced DR-DOS 7.01.0x (BDOS 7.2)
********* Dell Real Mode Kernel (DRMK)
****** Novell DOS 7 updates 11–15.2 (BDOS 7.2)
******* Caldera [[DR-DOS]] 7.02-7.03 (BDOS 7.3)
******** [[DR-DOS "WinBolt"]]
******** OEM DR-DOS 7.04-7.05 (BDOS 7.3)
******** OEM DR-DOS 7.06 (PQDOS)
******** OEM DR-DOS 7.07 (BDOS 7.4/7.7)
* [[FreeDOS]] ([[open-source software|open source]] DOS variant)
* [[Apple ProDOS|ProDOS]] (operating system for the [[Apple II]] series computers)
* [[PTS-DOS]] (MS-DOS variant by [[Russia]]n company [[Phystechsoft]])
* [[TurboDOS]] (Software 2000, Inc.) for [[Zilog Z80|Z80]] and [[Intel 8086]] processor-based systems
* Multi-tasking user interfaces and environments for MS-DOS compatible operating systems
** [[DESQview]] + [[QEMM 386]] multi-tasking user interface
** DESQView/X ([[X Window System|X-windowing]] GUI