This document written and maintained by Allen Garvin (agarvin@tribalddb.com) ---------------------------------------------------------------------------- Quick Definitions: UNIX: Operating system whose ultimate roots are 6th & 7th editions. Usually contains actual AT&T-derived code (excepting 4.4BSD). UNIX-clone: Operating system which very strongly resembles traditional UNIXes. Usually implemented with no AT&T-derived code. UNIX-like: Operating system which resembles traditional unix in system calls and/or interface ---------------------------------------------------------------------- | Current UNIXes | ---------------------------------------------------------------------- OS: HP-UX Company: Hewlett Packard Current: 11i Newsgroup: comp.sys.hp.hpux URL: http://unix.hp.com/operating/index.html FAQ: ftp://rtfm.mit.edu/pub/usenet-by-hierarchy/comp/sys/hp/hpux/* Comments: 1:System III-based 1.2: <1987> SVR2 2: <1988> SVR3 3: <1988> 5: SVR2 Some BSD 6: 7: SVR3, some BSD (long filenames, symlinks, sockets, et al) [680x0] 8: shared libs, SVR3.2 (+~80% BSD) [680x0 300/400; 700 PA-RISC] 9: DCE, SAM, Motif [680x0 400; 700/800 PA-RISC] 10.x: SVR4. Journaled file system [PA-RISC] 11: 64bit [PA-RISC; IA-64 in future?] OS: Solaris Company: Sun Current: 8 Newsgroups: comp.sys.sun.*, comp.unix.solaris FAQ: ftp://rtfm.mit.edu/pub/usenet-by-hierarchy/comp/unix/solaris/* Comments: 1.0: Retroactive name of SunOS 4.1.2 (see below) (last release is Solaris 1.1.1 == SunOS 4.1.4) 1.1: OpenWin 3 2.x: SVR4, threaded kernel, SMP, kerberos, CDE; compiler unbundled [SPARC; i386] 2.0: Announced <1989>, released 2.1: SMP support, first x86 support 2.3: OpenWin 3.3 (X11R5) 2.5: NFSv3; Sendmail 8; POSIX threads; POSIX ACL's 2.5.1: PPC architecture support added for this version only 2.6: NFSv3 enhancements; Doors IPC; largefiles; X11R6 7: 2.X numbering scheme changed to X; real 64-bit option; optional journaling on UFS 8: IPv6 & IPsec; GNU tools + apache; Semi-free at first. 9: <2002> New volume manager. Improved UFS. OS: IRIX Company: SGI Current: 6.5.8 Newsgroups: comp.sys.sgi.* URL: http://www.sgi.com/developers/technology/irix/ Comments: 1 & 2: BSD-based?? [Motorola 680x0?] 3: SVR3 [MIPS] 4: <1990> SVR3.2 with much BSD. GL. POSIX [MIPS] 5.x: <1993> SVR4 [MIPS] 6.x: <1994> 64-bit. [MIPS] OS: AIX Company: IBM Current: 4.3.3 Newsgroup: comp.unix.aix FAQ: ftp://rtfm.mit.edu/pub/usenet-by-hierarchy/comp/unix/aix/* Comments: Originally SVR2, with many BSD extensions over the years. Rather unique among UNIXes, with assorted oddities. 1: <1986> SVR2 [i386 (IBM PS/2)] 2: <1987> [PC RT, a RISC-based system] 3: <1989> Logical Volume Manager [RS/6000 PPC; S/370?] 4.x: [RS/6000 PPC] 5L: unreleased at present [RS/6000; IA-64] OS: OS/390 Company: IBM Current: Newsgroup: Comments: Mainframe OS that thas been UNIX-fied. Relationship to AIX/ESA? OS: BSD/OS Company: BSDi Current: 4.1 Newsgroups: comp.unix.bsd.bsdi* URL: http://www.bsdi.com Comments: Originally called BSD/386. Do not confuse with 386BSD 1: <1992> BSD/386, based on 4.3 Net/2. Subject of lawsuit by AT&T. 2: <1994> 4.4-Lite merged in. 3: <1997> 4: <1998> Runs Linux. SMP support. OS: NetBSD Company: NetBSD Project Current: 1.4.3 Newsgroups: comp.unix.bsd.netbsd* URL: http://www.netbsd.org Comments: 0.8: 386BSD-based [i386 only?] 1.0: <1994> 4.4-lite based. [i386, SPARC, MIPS, 680x0, Mac, PA-RISC, VAX, et al] OS: FreeBSD Company: FreeBSD Project Current: 4.1.1 Newsgroups: comp.unix.bsd.freebsd* URL: http://www.freebsd.org Comments: 1: <1993> Based on 386BSD (Net/2) 2.0: <1994> Based on 4.4-Lite [i386; alpha] 4.0: <2000> OS: OpenBSD Current: 2.7 Newsgroups: comp.unix.bsd.openbsd* URL: http://www.openbsd.org Comments: Offshoot of NetBSD. Code has been heavily audited for buffer overflows and other possible exploits. "Secure by default" 1.0: <1995> OS: Tru64 Company: Compaq Current: 5.4 Newsgroups: comp.unix.osf, comp.unix.tru64 URL: http://www.tru64unix.compaq.com/ Comments: Initially known as OSF/1, developed by the Open Software Foundation. (HP, DEC, Apollo, IBM, Bull, Siemens-Nixdorf). Based on top of the Mach kernel. Rather unusual mix of SVR3 & BSD (now known as System V Environment). After OSF disbanded, Digital changed the name to Digital UNIX. Compaq acquired digital in '98. 1: <1990> Motif, SMP support, dynamic loading, DCE. Mach 2.5 [MIPS] 1.1: <1992?> Mach 3.0-based kernel 1.2: [Alpha-based] 3.2: <1996> Renamed Digital UNIX 4.0D: <1999> Renamed Compaq Tru64 UNIX OS: UnixWare Company: SCO (Caldera?) Current: 7.1.1 Newsgroup: comp.unix.unixware URL: http://www.sco.com/unixware/ FAQ: ftp://rtfm.mit.edu/pub/usenet-by-hierarchy/comp/unix/unixware/* Comments: Originally produced by Univel, which was acquired by Novell, then sold to SCO. 1: <1992> SVR4.0 [i386] 1.1: <1993> Novell UnixWare 2: <1995> SVR4.2MP 2.1: SCO acquires UW [any versions between 2.1 & 7??] 7: <1997> "Gemini" SCO Unixware (branded SVR5, some OpenServer features) OS: OpenServer Company: SCO (Caldera?) Current: 5.0.6 Newsgroup: comp.unix.sco* URL: http://www.sco.com/openserver Comments: Originally SCO UNIX (1989), then SCO ODT (to version 3). Based on SVR3.2, with most SVR4 features. OS: DYNIX/pts Company: Sequent (subsidiary of IBM) Current: 4.x?? Newsgroup: [none?] URL: http://www.sequent.com/software/operatingsys/dynix.html Comments: Name originally owned by SCO prior to Xenix. Sold to Sequent. Pioneered SMP support under UNIX. Originally a "dual universe" system based on 4.2BSD & SVR3. Now SVR4. OS: DG/UX Company: Data General Current: 4.2 Newsgroup: [none?] URL: http://www.dg.com/products/html/dg_ux.html Comments: Based on SVR4, with custom SMP support. Older systems were based on Motorola 88k CPUs; now high-end i386. OS: UNICOS Company: Cray (subsidiary of SGI) Current: Newsgroup: comp.unix.cray URL: Comments: First 64-bit UNIX implementation; unusual internals. First SMP support in commercial UNIX. Based on SVR4. What is CSOS? 1: <1985> 6: SVR3 7: SVR4 OS: Reliant UNIX Company: Fujitsu-Siemens Current: 5.45 Newsgroup: URL: http://www.fujitsu-siemens.com/servers/rm/rm_us/reliant.htm Comments: Derived from SINIX. Popular in Europe. OS: MachTen Company: Tenon Current: Newsgroup: comp.unix.machten URL: http://www.tenon.com/products/machten/ FAQ: http://www.ugu.com/sui/ugu/show?I=machten.faq Comments: 4.4BSD on mach kernel for Macintoshes (both 680x0 & PPC), implemented on top of MacOS. Utilizes Mach 2.5 kernel. OS: MAXION/OS Company: Concurrent Current: URL: http://www.ccur.com/realtime/maxion.html Comments: Derived from earlier RTU (real time unix) & Harris CX/UX (see below). SVR4.2MP-based, on MIPS & PPC platforms. ---------------------------------------------------------------------- | UNIX-clone systems | ---------------------------------------------------------------------- OS: GNU/Linux Company: not applicable; many companies Current: 2.4 kernel Newsgroup: comp.os.linux* FAQ: ftp://rtfm.mit.edu/pub/usenet-by-hierarchy/comp/os/linux/* Comments: Open-source (GPL) Unix clone, POSIX-compliant. Actually just a kernel, the OS that people think of as "Linux" is usually a set of mostly GNU tools bundled together into "distributions" (c.g., RedHat, Slackware, Debian, et al). 1.x: 2.x: SMP support [Many platforms & architectures] 2.4: Journal file system, LVM, rewritten virtual memory system OS: HURD Company: Free Software Foundation Current: URL: http://www.gnu.org/software/hurd/ Comments: Based on Mach 3 kernel. Work started in 1991. OS: Minix Company: Prentice-Hall Current: 2.0.2 Newsgroup: comp.os.minix Comments: Conceived as a small clone of the 7th edition of UNIX. Written by Andrew Tanenbaum for pedagogical purposes. Code is freely available, but cannot be modified and redistributed (patches are allowed to be distributed). 1.0: <1987> Included in textbook "Operating Systems: Design and Implementation" by Tanenbaum and Woodhull 1.5: [x86, including 8086; 680x0; SPARC] 2.0: POSIX-compliant (fully?) [x86; SPARC] OS: LynxOS Company: Lynux Works (formerly Lynx Real Time Systems) Current: 4.0 Newsgroup: comp.os.lynx URL: http://www.lynuxworks.com/products/whatislos.html Comments: POSIX-compliant real time UNIX-clone (no AT&T-based code). OS: QNX Company: QNX (formerly Quantum Software) Current: 4.21 ? Newsgroup: comp.os.qnx URL: http://www.qnx.com/products/os/qnxrtos.html Comments: Real-time unix-like OS for [x86] systems 1: <1981> First microkernel OS for PC 3: <1990?> POSIX.1 certified kernel [i386] 4: most of POSIX.1b ---------------------------------------------------------------------- | Older UNIXes, dead and/or obsolete | ---------------------------------------------------------------------- OS: UNIX Company: AT&T Last release: System V Release 4.2 Comments: The original UNIX of all UNIXes. Originally part of Bell labs, became commercial product with divestiture of AT&T. Ownership transferred to UNIX Systems Laboratories around 1990, which was purchased by Novell around 1993. See UnixWare for subsequent details. First 7 versions are named after their printed manuals. Later in-house versions at Bell Labs continued the same naming scheme (through the 10th edition in late 80s). (work began in 1989 on PDP-8) 1st edition: <1971> fork(2), sh, ed, roff [PDP-11] 2nd edition: <1972> pipes 3rd edition: <1973> 4th edition: <1973> rewritten in C 5th edition: <1974> 6th edition: <1975> Released outside of Bell Labs. 7th edition: <1978> Online man pages, uucp, awk, adb, make 32V: 32-bit port on Interdata. System III: <1982> named pipes. System IV: in-house version, never publicly released. System V: <1983> shared memory, message queues, semaphores System V Release 2: <1985?> opendir, readdir System V Release 3: <1987> STREAMS, RFS System V Release 3.2: <1988?> SCO collaboration System V Release 4: <1989> Lots from BSD & SunOS (sockets, UFS, NFS, etc), shadow passwords (in optional security addon) System V Release 4 MP: <1992> SMP support System V Release 4.2: <1993?> Dynamic libraries? OS: BSD Company: Unix Systems Computer Group at University of California, Berkeley Last release: 4.4 Newsgroup: comp.unix.bsd Comments: See FreeBSD, BSD/OS, OpenBSD, NetBSD for modern derivatives. 1: <1977> Tape of utilities for Version 6 (ex, csh, trek, et al) 2: <1978> More utilities (csh & job control, et al). Sold for $60. 2.8: <1981> full OS for PDP-11, with parts of 3 & 4BSD 2.11: <1992 thru 1999>. Contains much of 4.4BSD [PDP-11 only] 3: <1979> paging virtual memory system. First complete OS released by Berkeley. [VAX] 4: <1980> reliable signals. FFS (Fast File System), delivermail (== sendmail) 4.1: <1981> 4.2: <1983> socket support 4.3: <1986> 4.3-Tahoe: <1988> Version for extinct Harris Tahoe minicomputer; last "true" BSD (or even Unix) in some eyes. 4.3-Reno: <1990> POSIX-ified 4.3 Net/2 (4.3 Lite): <1991> Subject of lawsuit by AT&T, Novell 4.4: <1993> Last release from CSRG at UCB. Immutable files, more passwd fields, SV IPC. OS: SunOS Company: Sun Last release: 4.1.4 Newsgroups: comp.sys.sun.* Comments: SunOS is used here to refer to the BSD-based operating system prior to the SVR4-based Solaris 1: <1982> 4.1BSD-based [680x0] 2: <1985> 4.2BSD-based; NFS 3: <1985> 4.2 & 4.3BSD; NeWS; FIFOs; SV IPC 4: <1989> 4.3BSD with many SV extensions (STREAMS, etc). POSIX. also sold as "Solaris 1" (Solaris 1.0 == SunOS 4.1.2) [680x0; SPARC; i386]. 5: (See Solaris above; Solaris still uses the SunOS designation internally) OS: Xenix Company: SCO Last release: System V Newsgroup: comp.unix.xenix* FAQ: ftp://rtfm.mit.edu/pub/usenet-by-hierarchy/comp/unix/xenix/* Comments: First UNIX for intel 8086, from Microsoft; Microsoft sold Xenix to SCO. Many proprietary extensions in early days. Several features found their way into SVR4. 3: <1983> [x86 only] 5: <1987> First 32-bit UNIX for x86 platform (386). SV: <1988?> mostly SVR3 OS: 386BSD Company: Not applicable; work of Bill & Lynne Jolitz Last release: 1.0 Newsgroup: comp.unix.bsd.386bsd.misc Comments: Based on Net/2 release of BSD. Partially MACH-based, with threads. See assorted Dr Dobbs, 1992. Very important historically to modern BSD development. 0.1: 1.0: <1994> OS: NeXTSTEP Company: NeXT (owned by Apple) Last release: 4.0 Newsgroup: comp.sys.next* Comments: 4.3BSD on top of MACH microkernel, with proprietary GUI written in ObjectiveC. Large influence on Mac OS X. Based on Mach 2.0 kernel at first, later 2.5. 1: <1988> DisplayPostscript [NeXT hardware (68040] 2: <1990> 3: <1992> 3.1: [i386 support added?] 3.3: [PA-RISC & SPARC support added] 4.0: Released after Apple acquired NeXT [NeXT; i386; PA-RISC; SPARC] OS: Ultrix Company: DEC (now part of Compaq) Last release: 4.5 Newsgroup: comp.unix.ultrix Comment: ULTRIX-11 [PDP-11], ULTRIX-32 [VAX] 1: <1984> 4.2BSD [PDP-11; 32V on VAX] 2: Some SVR2 features? 3: [VAX, PDP-11, MIPS] 4: [VAX & MIPS; PDP-11 support dropped in 3] POSIX 4.5: <1995> OS: DomainOS Company: Apollo Last release: SR10.4 Newsgroup: comp.sys.apollo Comment: last version was "Dual Universe" UNIX (see also DYNIX, PyramidOS). Acquired by HP around 1990. Some contributions to OSF/1. Previous version (SR9.*) was Domain/IX (and before that Aegis). [680x0] OS: DC/OSx Company: Pyramid Last release: 2.0? (references to OSx 5.1) Newsgroup: comp.sys.pyramid Comment: Originally a "Dual Universe" UNIX (PyramidOS?) derived from SVR3 and BSD. Later versions were SVR4 on MIPS. Pyramid is now owned by Siemens-Fujitsu. OS: Interactive UNIX (ISC UNIX) Company: Interactive Systems Corp (now owned by Sun) Last release: 4.0 Comment: Bought by Sun around 1992, who dropped support shortly thereafter (marketted for a while as a Solaris transition, before Solaris 2 released). Originally PC/IX (System III & System V (rel 1)) around 1983. Last release was based on SVR3.2 (SVR4 released briefly?). 4: TCP/IP, NFS support OS: Coherent Company: Mark Williams (out of business 1995) Last release: 4.0 Comments: UNIX-clone of 7th edition, with some SV IPC. Ran on 80286. 4: <1993> TCP/IP support OS: A/UX Company: Apple Last release: Newsgroup: comp.unix.aux Comments: 2.0: SVR2 with 4.2BSD; system 6 Mac apps. 3.0: <1992> SVR2.2 with 4.3BSD, soem SVR3/4 extensions. X11R4, MacX. System 7 Mac apps. 4.0: ?? OS: BOS Company: Bull Last release: Comments: Also BOS/X and AIX for Bull's PPC... how does it relate to below? 1: <1990> SVR3 with BSD extensions (FFS, select, sockets), SMP, X11R3 [680x0] 2: <1991> job control, disk mirroring, C2, DCE OS: CX/UX Company: Harris (now Concurrent) Last release: 7.1 Newsgroup: comp.sys.harris Comments: Dual-universe SVR3 & 4.3BSD On Harris Night Hawks [motorola 68k & 88k]. Marketted by 3 designations: CX/UX, CX/SX (Secure), CX/RT (Real-Time). Essentially the same code tree. 6: POSIX. 7.1: OS: RTU (Real Time UNIX) Company: Concurrent Last release: 6.0? Comments: Well-known early real time Unix. motorola 68k-based Masscomp. 3: BSD? 4: SVR2 with BSD 5: SVR3 with BSD (dual-universe) OS: UTX/32S Company: Gould Last release: 1.0? Comments: Based on top of 4.2BSD, implemented C2 auditing; Trusted Computing Base which involved trusted/untrusted access by users to system resources. Ran on custom hardware. OS: HELIOS Company: Perihelion URL: http://www.perihelion.co.uk Comments: Designed specifically for parallel processing. Ran on INMOS (a risc processor) transputer (Atari made a few). Dated from around 1987. Based on Mach 2.0 kernel at first, later 2.5. OS: Cromix Company: Cromemco 11 URL: http://www.cromemco.com Comments: Originally running on a [Z-80] (from the company that produced the first Z-80-based computer), this was the first UNIX-like OS on a microcomputer. Did not contain UNIX code? Later on [680x0] OS: FTX Company: Stratus Last release: 3? Comments: Fault Tolerant Unix. [680x0, i860, i960] OS: NEWS-OS Company: Sony Last release: 6 Comments: SVR4.2-based. Early versions on [680x0], after <1991> on [MIPS] Popular in Japan. Sony ceased production in <1998> 1: <1987> 5: ELF OS: Texas Instruments System V Company: Texas Instruments Last release: 3.3.2 Comments: SVR3-based, on TI 1500 line of computers [680x0]. SMP-support from start. Featured bsh ("business shell"), a custom shell. Sold to HP in <1992>. 1: <1986> [68020] OS: MP-RAS UNIX Company: NCR Last release: 3.02 Comments: Launched in 1982 on [680x0] hardware. Continued on motorola through SVR3, switching to [i386] around the time they were bought out by AT&T <1991>. Spun off from AT&T in 1995. 3: SVR4 MP OS: UXP/DS (formerly DRS/NX) Company: Fujitsu (formerly ICL) Last release: 7.7 Comments: Later versions (SVR4.2) on [SPARC] 3.2: SVR3.2 OS: Eurix Company: GmbH Last release: 2 Comments: German UNIX. Company also produced Munix in early <1980's> 1: <1989?> SVR3.2. German release only [i386] 2: <1991> SVR4, multi-lingual support OS: Munix Company: GmbH Last release: SVR2 Comments: German UNIX, originally based on Version 7, first released in <1982> for QU68000 [68000] & DEC PDP-11. Later versions ran on 680x0 and implemented Munix/Net, a networking alternative to DECnet & TCP/IP, popular in Germany for a while. See Eurix above. ---------------------------------------------------------------------- | Other UNIXes | ---------------------------------------------------------------------- Assorted System V Release 4 derivatives COMPANY NAME PLATFORM NOTES AT&T SV/386 i386 See above. Consensys SVR4.2 DELL SV i386 ESIX SVR4 i386 http://www.esix.com Generics SVR4.03 i386 German Microport SVR4 i386 http://www.microport.com Olivetti LSX UHC SVR4 i386 Unisys SVR4 i386 Amiga Amiga UX SVR4 68030 Assorted OSF/1 derivatives COMPANY NAME PLATFORM NOTES Paragon OSF/1 i860 on Paragon Supercomputer Hewlett-Packard OSF/1 PA-RISC publicly released? Hitachi OSF/1-MJ HI-370 DEC OSF/1 DECstation 1.0 DEC OSF/Rose DECstation Same as above, prior to ELF. Dascom AD V1.1 i386 Others COMPANY NAME BASE OS NOTES Acorn RiscIX [Risc PC] Archipel SA VOLVIX SVR3.2, BSD4.4 Alcyon Regulus RT UNIX OS on [680x0] Altos Altos System V SVR3.2 [i386] Alliant Concentrix 4.3BSD SMP [680x0 MP] Amdahl UTS 2.1.5 [Mainframe-based] Auragen AurOS Ballistic Research \ Labs BRL UNIX 4.3BSD <1988> [VAX] Carnegie-Mellon MacMach 4.3BSD on Mach 3.0 on [680x0] macs only Charles River \ Data Systems UNOS 9.2 UNIX-clone real-time OS [680x0] Chorus MiXV SVR3.2, SVR4 "over Chorus nucleus" Codata Unisis 3.1.1 V7 [68000]. Acquired by SCO 1990 Control Data EP/IX RISC/OS, SVR[34], BSD POSIX [MIPS] Convergent CTIX 6.4.1 SVR3 previously CTOS?? Convex ConvexOS 10.1 4.3BSD Acquired by HP in 1994 [Convex supercomputers] Convex SPP-UX HP-UX [PA RISC] SPP-UX - Convex Data General Sphinx Denelcor HEP-UPX Direct parallel execution Diab Systems DNIX SV Real-time Unix [DIAB DS90] Emerge Systems RTUX Real-time UNIX [680x0] Fortune Systems FOR:PRO V7 [Fortune 32:16] Encore Umax 5.2 BSD [Motorola 88k] Everex ENIX SV Heurikon UniPlus+ SV [68010] Hitachi HI-UX 03 HP-UX Sold in Japan only Human Computing \ Resources RT/EMT V7 [PDP-11] IBM CPIX V7 (later SIII?) <1982> IBM AOS BSD? <1982> [PC RT] Interactive IS/3 SIII [PDP-11; VAX] Interactive VM/IX SIII [VM/360] Introl INOS [Artisan 6809] JMI Software C Executive Unix-like real-time OS Microware OS 9 Unix-like real-time OS [680x0] Mt Xinu Mach386 4.3BSD-Tahoe on Mach 2.5 [DEC LSI] Mt Xinu more/BSD 4.3BSD-Tahoe [VAX, HP 680x0] Marrow Designs Micronix National \ Semiconductor Genix 4.2BSD early 80's [NS16032, NS32032] NEC UX SV late 80's, early 90's Norsk Data NDIX BSD Norwegian? Omega TOS Thoroughbred Operating System Opus Systems Opus 5 SVR3 [88k] coprocessor in PCs Perq Systems PNX 5.02 version 7 & SIII [PERQ 680x0] Plexus System B? SV Phase 1 Oasis Spider Systems QNIX SV Runs on top of Accent (CMU Mach \ forbearer) [PERQ 680x0] Tektronix TNIX V.3 SV [Tektronix] Tektronix UTEK 4.0 4.2BSD [ver 3: NS32032; ver 4: 680x0] Sequoias Enterprise \ Systems Topix 6.7 Transaction-oriented UNIX SGS-Ates SUNIX SIII & BSD [Z-8002] Solbourne OS/MP 4 SunOS derivative Basically, multi-processing SunOS SRI Eunice Oddball UNIX-simulator on top of VMS Stardent Stellix SV with BSD? [titan 1500/3000] UCB NachOS Tiny UNIX-like instructional OS University of \ Canberra Xinu UNIX-clone [LSI; 680x0; i386; Sparc] VenturCom Inc Venix SIII on PDP-11/SV on x86 Whitesmith Idris V7 Unix-clone. [8086; VAX; 68000; PDP-11] ZENY System V/386 SVR3.2 Zilog Zeus V7 [Z8001] Zenith ? SVR3 (Tudor Hulubei) Thix Unix-clone (kernel from scratch) (Frank Naumann) FREEMiNT Unix-like OS for Atari [680x0] (various) UZIX V7 Unix-clone, from scratch [Zilog MSX] ? DVIX SVR2 ? ACIS 3/ACIX 4 IBM PC RT BSD-based? ? Arix SV ? MipsOS SV (prev. BSDish) ? MMOS Real-time UNIX Unconfirmed: COMPANY OS COMMENTS CCI Perps CIM Corp. Serix DMC Uni-Dol Unidos Unidos IBM/Interactive VM/LX [UNIX on 370s??] ONYX Onix Unisys SX-110 Unix or not?