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) 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 DOS variant) ProDOS (operating system for the Apple II series computers) PTS-DOS (DOS variant by Russian company Phystechsoft) TurboDOS (Software 2000, Inc.) for Z80 and Intel 8086 processor-based systems Multi-tasking user interfaces and environments for DOS DESQview + QEMM 386 multi-tasking user interface for DOS DESQView/X (X-windowing GUI for DOS) Network operating systems Banyan VINES – by Banyan Systems Cambridge Ring Cisco IOS – by Cisco Systems Cisco NX-OS – previously SAN-OS CTOS – by Convergent Technologies, later acquired by Unisys Data ONTAP – by NetApp ExtremeWare – by Extreme Networks ExtremeXOS – by Extreme Networks Fabric OS – by Brocade JunOS – by Juniper NetWare – networking OS by Novell Network operating system (NOS) – developed by CDC for use in their Cyber line of supercomputers Novell Open Enterprise Server – Open Source networking OS by Novell. Can incorporate either SUSE Linux or Novell NetWare as its kernel Plan 9 – distributed OS developed at Bell Labs, based on Unix design principles but not functionally identical Inferno – distributed OS derived from Plan