1954

Non Unix family tree and Timeline Version 0.4.0 1956 Copyright 2003, 2004, 2007 Patrick J C Mulvany

GM OS 1955

1957

SAGE 1957?

1958 SABER FMS 1958 1958 Late 1950's

SOS 1959

1960 1960

IBM 1410/7010 OS Early 1960's CTSS 1961-1962 1962 IBSYS MCP PDP-1 OS DECtape 1962 Early 1960's (B5000) 1962 Library System Basic Executive System 1962 Early 1960's

SABRE B1 1962-64 PDP-6 Monitor Early 1960's MCP 1964 EXEC I 1964 TOS (B5500) 1964 MCP Early 1960's 1964 AOS B2 (B6500) Tops-10 1.4 Admiral Early 1960's DOS 1969? 1964 Early 1960's 1965 OS/360 STSS Multics (BOS, TOS,DOS) 1965? 1965 B3 1965 EXEC II Early 1960's CP-40 MCP Early 1960's Tops-10 1.9 MTS Atlas I Supervisor 1966 (CP-67) (B5700) MS/8 B4 1966 1966 1966 1966 1966-1996 Mid 1960's MCP Early 1960's (B6700) CAL OS/PCP 1972? CHIPPEWA BPS/360 CP/CMS OS/MVT Tops-10 2.18 ITS WAITS EXEC 3 Late 1960's Late 1960's Late 1960's Late 1960's 1967 1967 MCP 1967 1967 1967 Late 1960's (B5900)

1968 PARS Tops-10 3.27 TSS-8 George 1 1968 MCP SCOPE TDOS IDA 1968 MCP 1968 1967-1968 Late 1960's (B2500/B3500) Late 1960's Late 1960's Late 1960's (B7700) EXEC 4 Late 1960's VMOS George 2 ACP v4 MCP Tops-10 4.50 TENEX Unix ACP EXEC 8 Late 1960's SOS OS/MFT MSS 4.0 Late 1960's 1969 MCP (B1500) 1969 1969 1969 1969 Late 1960's Late 1960's? MCP 10/1969 (B6800) (B2700/B3700) Tops-10 4.72 1969 MSS 5.0 George 3 1970 12/1969 Late 1960's 1970 MCP Tops-10 5.01 DOS/Batch 11 MSS 6.0 MCP MCP (B1700) 1970 1970 3/1970 (B7800) (B2800/B3800) 1972? MUMPS MSS 7.0 George 4 DOS 3/1970 Late 1960's TSO 1970 MSS 8.0 1970's? MCP MCP RSX-15 6/1970 MCP (B1800) (B2900/B3900) Late 1970 (B6900) MSS 9.0 1971 8/1970 1971 MCP II MUMPS-15 MSS 10.0 MCP (B1000 Series) Tops-10 5.02 10/1970 ACP v8 MCP Tape Scope 2 KRONOS (V400/V500) 1971 MSS 11.0 (B7900) OS/8 P?S/8 RSTS-11 Early 1970's Early 1970's EMAS 11/1970 VS/9 (PS/8) 1971 1971 Chios Early 1970's Early 1970's VM/CMS 1971 MSS 12.0 Earl 1970's 12/1970 MultOS/8 MSS 13.0 1972 OS/VS1 MULTI-8 Tops-10 5.03 BKY 1972 RSX-11D? 12/1970 1972 1972 MUMPS-11 Early 1970's 1971? MSS 14.0 COS-310 MULTOS Tops-10 5.04 1/1971 RDOS 1.00 DOS/VS 5/1972? MSS 15.0 1972 KI-TELNEX RSX-11S RSX-11M 4/1971 1972 Tops-10 5.05 mid 1972 EMAS 2900 1971? MPE-A ETOS 7/1972? Late 1970's 12/1972 Tops-10 5.06 1973 11/1972 1973 CAPS-8 CAPS-11 MSS 18.0 12/1972 OS8 RSX-11D 5/1973 OS/8 V3Q RT-11 Alto MPE-B LAP6-DIAL 7/1973 1973 10/1973 OS/VS2 r1 OS/8 V3R 1974 1974 MCP MCP/AS MSS 22.0 1974 SRT8 (A Series) (A Series) RSX-11M 1/1974 6/2/1974 1984? 1984? SCPSYS 1974 Tops-10 5.07 Tops-10 6.01 RTS/8 v1 MR 1.0 CP/M 1.0 5/1974 5/1974 21/6/1974 6/1974 1974 OS/VS2 r2 7/1974 RT-11 v2 MPE-C DOS/VSE AL/1 LOS v1 1979 1974 Late 1974 12/1974 1975 IAS MR 2.0 1975 1/1975 OS/VS2 MVS r3 MR 2.1 3/1975 Tops-10 5.07A Tops-10 6.01A 3/1975 5/1975 5/1975 RSX-20F MR 2.2 Late1975? 6/1975 MiniDOS RTS/8 v2 Tops-10 6.02 MR 3.0 RSTS/E v5.7 9/1975 19/12/1975 1975 Tops-20 1 MSS 28.0 AOS 1976 MR 3.1 1976 2/1976 2/1976 1976 3/1976 Tops-20 1A RSTS/E v6A MR 4.0 VSE 4/1976 CP/M 1.3 OS/12 RT-11 v2C 1976? 7/1976 MPE II Tops-20 1B 1976 DOS MiniFLEX v1.0 1976 COS (Series II) 10/1976 MR 4.0.1 1976 9/1976 1976 6/1976 Tops-20 101B RSTS/E v6B MR 5.0 12/1976 1977 Late 1976? 12/1976 1977 Tops-10 6.03 RSX-11M v3.0 p-System I.0 3/1977 CP/M 1.4? VSE/SP MVS/SP RTS/8 v2B VMS X0.5 AMOS RT-11 v3 p-System I.3 p-System I.4 p-System I.5 22/6/1977 1977 FLEX v1.0 1977? 1977 Tops-20 2 RSX-11D v6A 8/1977 1977 7/1977 Late 1977? MR 6.0 10/1977 EMAS Late 1970's 1978 RSX-11D v6.2 1978 VMS 1.0 OS/78 Tops-10 6.03LIR Tops-20 3 Late 1977? MR 6.1 IAS v2.0 RSX-11M v3.1 2/1978 (OS/8 V3D) 2/1978 1/1978 3/1978 AppleDOS 3.0 Early 1978? Early 1978? 15/2/1978 6/1978 OMNI-8 RSX-11D v6B FLEX 9 UniFLEX RDOS 6 MPE III VMS 1.5 AppleDOS 3.1 1978-1990 MR 6.5 1978 (Series III) 1978 7/1978 OS/78 V2 9/1978 6/1978 23/5/1978? Tops-20 3A MR 6.5a 9/1980 12/1978 1979 ACP v9.2.1 RTS/8 v3 1979 19/1/1979 IAS v3.0 RSX-11M v3.2 MR 7.0 AppleDOS 3.2 p-System II.0 2/1979 OS/78 V3 Early 1979? Early 1979? 3/1979 2/1979 ICOS DOS EMAS 2900 p-System II.1 OS-9 1979? 1979? MVS/370 MR 7.0a Late 1970's CP/M 2.0 6/1979 1979 ACP/TPF 1979 Tops-10 7.00 1979 AppleDOS 3.2.1 MR 7.0b 12/1979 8/1979 RSTS/E v6C 7/1979 Apple II Pascal 1.0 9/1979 Late 1979? 8/1979 p-System III.0 AOS 4.00 1980 RT-11 4 RSX-11M+ v1.0 VMS 2.0 CP/M 2.2 MP/M-80 AOS/VS 1980 Tops-20 4 CCPM-80 21/2/1980 Early 1980? 4/1980 MR 8.0 1980? 1980 4/1980 3/1980 CCP/M-68k Apple CP/M CP/M-80 QDOS 0.1 3/1980 AppleDOS 3.3 8/1980 1980 MPE IV VMS 2.1 8/1980 Apple II Pascal 1.1 (Series 44) 1980? ICOS II Tops-10 7.01 1980 86-DOS 0.3 SOS 1.0 1980 8/1980 MR 8.2 12/1980 11/1980 AOS 4.10 AOS/VS 1.50 1981 MVS/XA VMS 2.2 12/1980 1981 VM/SP 1981 1981 SOS 1.1 Star MP/AOS 1.30 Micro/RSTS VMS 2.3 2/1981 1981 OS/78 V4 1981 ICOS III PC DOS 1.0 AMOS 4.5 27/4/1981 Micro/RSX v1.0 VMS 2.4 12/8/1981 OS 1981 1981? 1981 MP/M II MP/M-86 MPE IV VMS 2.5 1980's OS/278 MR 9.0 (Series 40) 1981? 10/1981 10/1981 PC DOS 1.1 CP/M-Z80 p-System IV.0 1982 Tops-20 5.0 VMS 3.0 MS DOS 1.24 1982 RSX-11M v4.0 RSX-11M+ v2.0 5/1982 1982? MP/AOS 2.00 1/1982? 4/1982 MR 9.1 6/1982 Early 1982? Early 1982? OS/278 v2 VMS 3.1 3/1982 Apple II Pascal 1.2 4/1/1982? 1982 AMOS/L 1.0 MS DOS 1.25 CP/M Plus (3.0) CP/M-68k pSOS RDOS 7.50 6/1982 VMS 3.2 7/1982 Q4 1982? 1982-1984 SOS 1.3 1982 1982 1982 MR 10.0 11/1982 RT-11 5.0.3 AMOS/L 1.0A RSX-11M v4.1 RSX-11M+ v2.1 VMS 3.3 10/1982 DG/RDOS AOS 4.69 WPS Late 1982? 1983 10/1982 Last 1982? Late 1982? 1982? LisaOS 1982? 1983 1/1983 MS DOS 2.0 PC DOS 2.0 MP/AOS-SU AMOS/L 1.1 3/1983 3/1983 1983? 3/1983 MPE V MS DOS 2.01 NetWare 1 (Series 42/48/68) 5/1983 1983 5/1983 CP/M-86 CCP/M-86 Apple ProDOS 1.0 MR 10.1 PC DOS 2.1 MPE V AMOS/L 1.1A VMS 3.4 9/1983 9/1983 10/1983 Tops-10 7.02 10/1983 10/1983 (Series 68C) 8/1983 11/1983 MS DOS 2.11 12/1983 MR 10.2 DRI GEMDOS Apple ProDOS 1.0.1 AOS/VS 5.0 9/1983 1984 12/1983 System 1.0 1984 1/1984 MS DOS 2.12 (Atari ST) 1/1984 1/1984 1984? 12/1983 1984 Apple ProDOS 1.0.2 MacWorks 2/1984 VMS 3.5 SIBO OS TripOS 1984 TOS 1.00 1984 1983? AMOS/L 1.2 (GEMDOS 0.13) 5/1984 VMS 3.5 1984 RT-11 5.1 GEM/1 System 2.0 CAOS 1984 VMS 3.7 PC DOS 3.0 1985 Apple ProDOS 1.1 1983? 1984 8/1984 8/1984 MP/OS 3.1 VMS 4.0 DR C PC DOS 3.2 Apple ProDOS 1.1.1 RSX-20F 9/1984 10/1984 9/1984 1988? MicroVMS 4.0 MS DOS 3.05 PC DOS 3.10 Apple II Pascal 1.3 TripOS VMS 4.1 12/1984 11/1984 11/1984 11/1984 (68k) 1984 1984? CDOS 4.1 Nanos 2.60 AOS/VS 6.06 1985 7/1985 1985

MS DOS 3.1 CDOS/XM 5.0 3/1985 7/1985 DiscOS GEM/2 GAMMA-11 DosPlus 1.0 1986 System 3.0 VSE/SP 2.1 VMS 4.2 AMOS/L 1.3 1985? RT-11 5.2 MR 11.0 1985 AOS/DVS 6/1985 1985 6/1985 1985 6/1985 1985 MPE V DosPlus 1.2 (Series 42XP) 7/1986 9/1985 AmigaOS 1.0 Windows 1.0 10/1985 20/11/1985 MS DOS 3.2 AmigaOS 1.1 12/1985 1986 PC DOS 3.20 System 4.0 12/1985 1986 1/1986 1/1986

NetWare 2.0 MPOS 1986 3/1986 AMOS/L 1.3B RT-11 5.3 PC DOS 3.30 DosPlus 2.0 5/1986 1986 5/1986 Windows 1.03 1986 AMOS 5 1986 System 5.0 AMOS 32 1.0 VMS 4.4 1986 1986 7/1986 1986 ProDOS 8 1.2 ProDOS 16 1.0 9/1986 9/1986 MPE V (Micro 3000 RX) 11/1986 VMS 4.7 MicroVMS 4.4 MR 12.0 AOS/VS 7.51 AMOS 32 1.0A AMOS/L 1.3C ProDOS 16 1.1 1986? 12/1986 12/1986 12/1986? 1987 12/1986 12/1986 CDOS 5.1 ProDOS 8 1.3 12/1986 AmigaOS 1.2 1987 1/1987 1/1987 1986/1987 System 5.? VM/SP 1.5 RT-11 5.4 OS/2 1.0 NetWare 2.11 3/1987 4/1987 ProDOS 8 1.4 GS/OS 2.0 Arthur 4/1987 8/1986? (CP/DOS) CDOS 5.2 AOS/VS 7.54 5/1987 5/1987 1987 2/4/1987 5/1987 5/1987 VSE/SP 3.1 6/1987 VAXELN 23 DosPlus 2.1 1987? MS DOS 3.3 Mid 1987 8/1987 Arthur 1.2 VM/SP HPO 1.5 1987? 10/1987 MS DOS 3.31 Dr CDOS/XM 6.0 11/1987 Dr CDOS/386 2.0 Windows/386 2.0 Windows 2.0 11/1987 GS/OS 3.1 1988 9/12/1987 9/12/1987 GEM/3 12/1987 1988 1/1988 Compaq Tops-20 7.0 DOS 3.31 MVS/ESA AMOS 2.0 6/1988 MPE XL 1988 3/1988 VMS 5.0 AOS/VS 7.62 3/1988? 4/1988 DrDos 3.3 AmigaOS 1.3 Windows/386 2.1 Windows 2.1 5/1988 ProDOS 8 1.6 1988 28/6/1988 28/6/1988 Dr CDOS/XM 6.2 Tops-10 7.04 6/1988 GS/OS 3.2 XDOS Dr CDOS/386 3.0 AMIGOS 1.0 7/1988 7/1987 1988 PC DOS 4.0 7/1988 ProDOS 8 1.7 8/1988? MPE XL 1.1 8/1988 8/1988 GS/OS 4.0 10/1988? OS/2 1.1 SE 9/1988 31/10/1988 System 6.0 VM/SP 1.6 AOS/RT32 MPE/iX MR 12.2 11/1988 11/1988 MS DOS 4.01 1988? AMOS 2.0A 11/1988 DrDos 4.41 AmigaOS 1.3/2024 12/1988 1989 12/1988 12/1988 12/1988 1989

AOS/VS II 1.00 VM/IS 1.6 VMS 5.1 4/1989 1989 OS/2 1.1 EE GEM/4 RiscOS 2 AOS/VS 7.64 1989 (Arthur 2) 5/1989 VM/SP HPO1.6 ProDOS 8 1.8 EPOC AOS/VS II 1.20 NetWare 3.0 5/1989 VSE/SP 4.1 6/1989 VMS 5.2 6/1989 GS/OS 5.0 1989 AmigaOS 1.3.2 1989? 7/1989 1989 1989 7/1989 1989

AMOS 2.1 9/1989 OS/2 1.2 VMS 5.3 10/1989 1989 MR 12.3 VM/XA SP 1.2.1 GS/OS 5.0.2 AOS/VS 7.67 AOS/VS II 2.00 12/1989 1990 12/1989 12/1989 12/1989 12/1989 1990

AmigaOS 1.3.3 RT-11 5.5 1990 AMIGOS 1.1 4/1990? ViewMAX/1 Windows 3.0 DrDos 5.0 22/5/1990 5/1990 RSTS/E v10.0 AmigaOS 1.3.4 7/1990 ProDOS 8 1.9 1990 8/1990

VM/ESA 1.1 VMS 5.4 10/1990 10/1990 Dr Multiuser DOS 5.00 AmigaOS 2.0 VSE/ESA 1.1 MR 12.4 GS/OS 5.0.3 1990 12/1990 1991 12/1990 12/1990 1991

GS/OS 5.0.4 Dr Multiuser DOS 5.01 2/1991 CDTV ViewMAX/2 1991

MS DOS 5.0 DrDos 6.0 pSOS+ AOS/VS II 2.03 6/1991 6/1991 RiscOS 3 NSS-DOS 1991? AOS/VS 7.69 7/1991 1991 1991 7/1991 VSE/ESA 1.2 9/1991 VMS 5.5 Windows 3.0 AmigaOS 2.04 11/1991 + Multimedia Ext System 7.0 10/1991 20/10/1991 OS/2 1.3 TOS 1.06 VMS 5.5-1 Late 1991 1991 (GEMDOS 0.19) VM/ESA 1.1.1 11/1991 12/1991 1991 1992 VMS 5.5-2 OS-9/6809 1992 11/1991 Concurrent DOS 5.1 ProDOS 8 2.0.1 GS/OS 6.0 OS/2 2.0 Novell Netware Lite Dr Multiuser DOS 5.1 NetWare 4.0 Windows 3.1 3/1992 1992 3/1992 3/1992 4/1992 System 7.0.1 6/4/1992 CCI Multiuser DOS 7.0 IMS Multiuser DOS 5.1 ProDOS 8 2.0.2? OS-9/68k 2.4 Dr PalmDOS "Merlin" Beta 1, 2 & 3 Enhanced Release AmigaOS 2.05 System 7.1 6/1992 ViewMAX/3 Beta NitOS 9 1992 MS DOS 5.0a ProDOS 8 2.0.3 GS/OS 6.0.1 1992 7/1992 7/1992 PC DOS 5.02 Win-OS/2 Dr PalmDOS Eval Rel, RC 1 & 2 CCI Multiuser DOS 7.1 NetWare 4.01 RSTS/E 10.1 8/1992 1992 8/1992 1992 SSP R4.0 Windows For 9/1992 CD-i RT-11 5.6 OpenVMS AXP 1.0 workgroups 3.1 DrDOS "Panther" Beta 1 OS-9/68k 2.5 10/1992? 11/1992 27/10/1992 10/1992 AmigaOS 2.1 DrDos 6.0 update Dr PalmDOS/Netware PalmDOS 1.0 11/1992 11/1992 6/1992 - 11/1992 CCI Multiuser DOS 7.21 VM/ESA 1.2.0 MVS/ESA R2 System 7.1.2 AmigaOS 3.0 1993 12/1992 12/1992 System 7.1 386 1992 1993 System 7.2 Novell Personal Netware 1.0 VSE/ESA 1.3 SSP R4.4 System 7.5 CCI Multiuser DOS 7.22 OS-9/68k 3.0 OS-9/68k 2.9 3/1993 MS DOS 6.0 30/3/1993 System 7.5.1 DOS/NT OS-9000 DR/IMS Multiuser DOS 5.11 OpenVMS 6.0 OS/2 2.1 DrDOS "StarTrek" (STDOS) 5/1993 7/1992 - 5/1993 VM/ESA 1.2.1 6/1993 Windows NT 3.1 PC DOS 6.0 7/1993 OpenVMS AXP 1.5 27/7/1993 Windows 3.11 1993 OS-9000/80x86 1993 ? SSP R5.0 Windows For workgroups 3.11 MS DOS 6.2 David 11/1993 CD32 8/11/1993 1993 VM/ESA 1.1.5 Novell Dos 7.0 System 7.5.3 SSP R5.0 + OS/400 v2R3 1994 12/1993 12/1993 NetWare 4.10 1994 VASP MS DOS 6.21 David 1.1 1994 dosemu DOS-C SSP R5.1 2/3/1994 MS DOS 6.22 DR/IMS Multiuser DOS 5.14 11/3/1994 System 7.5.5 OpenVMS 6.1 PD-DOS 6/1994 OS/400 v3R0.5 4/1994 SSP R5.1 + 3/6/1994 AmigaOS 3.1 VM/ESA 1.2.2 VASP PC DOS 6.3 RiscOS 3.5 Free-DOS 7/1994 1994 1994 7/1994 1994 SSP R6.0 Windows NT 3.5 21/9/1994

AROS

1995 1995 PC DOS 7.0 28/2/1995 NetWare 4.20 12/1998? VSE/ESA 2.1 SSP R7.1 4/1995 Windows NT 3.51 30/5/1995 PC DOS 8.0 VSE/ESA 1.4 OS/400 v3R1 OpenVMS 6.2 6/1995 MVS/ESA SP5R2 30/6/1995 6/1995 1995 Windows 95 MS DOS 7.0 24/8/1995 OS/400 v3R6 24/8/1995 Citrix WinFrame 29/9/1995?? 9/1995 IMS Multiuser DOS 7.0 FreeDOS

VM/ESA v2 R1 Windows 95 SP1 11/1995 OpenVMS 7.0 1996 OS/390 v1R1 12/1995 31/12/1995 BeOS Dr6 1996 3/1996 1/1996 Windows 95A OSR1 OS/2 Warp 3 AMOS 2.2 2/1996 1996 SSP R7.5 IMS Multiuser DOS 7.1 8/3/1996 VAXELN 4.5 RiscOS 3.7 4/1996 1996 OS/400 v3R2 BeOS Dr7 5/1996 OS/390 v1R2 21/6/1996 Windows NT 4.0 EPOC32 1996 9/1996 Windows 95B OSR2 1996 8/1996 MS DOS 7.10 pSOSystem 2.5 AMOS 2.2C OS/2 Warp 4.0 8/1996 1196? AMOS 2.3 9/1996 BeOS Dr8 OS/400 v3R7 10/1996 8/11/1996 Windows CE 1.0 9/1996 VSE/ESA 2.2 OpenVMS 7.1 11/1996 1997 12/1996 12/1996 1997 OS/390 v1R3 Caldera 3/1997 OpenDOS 7.01 NetWare 5.0 Mac OS 7.6 2/1997 1997? 1997 ChorusOS/Classix Windows 95B OSR2.1 11/3/1997 Windows CE 1.1 4/1997 BeOS APR Mac OS 8.0 5/1997 AMOS 2.3A 1997 OS/390 v2R4 6/1997 Windows NT 4.0 OS/2 Warp 4.5 IMS REAL/32 7.5 BeOS PR1 1997 7/1997 OS/400 v4R1 Service Pack 3 Mac OS 8.1 7/1997 29/8/1997 1997

BeOS PR2 Windows CE 2.0 Windows 95C OSR2.5 IMS REAL/32 7.51 10/1997 Windows NT 4.0 11/1997 11/1997 1997 VSE/ESA 2.3 VM/ESA v2 R3 Option Pack SkyOS 0.1 1998 12/1997 12/97 OS/390 v2R5 12/1997 12/1997 1998 1/1998 OS/400 v4R2 27/2/1998 IMS REAL/32 7.52 Caldera DrDOS 7.02 Mac OS 8.5 BeOS R3 3/1998 3/1998 Mac OS 8.6 Palm OS 3.0 VSE/ESA 2.3.1 OS/390 v2R6 VMS 7.2 IMS REAL/32 7.53 1998 Windows NT 7/1998 1998 ReactOS Windows CE 2.1 Caldera DrDOS 7.02A BeOS R3.1 Terminal Server Edition 6/1998 Windows 98 6/1998 6/1998 ChorusOS 6/1998 OS/400 v4R3 7/1998 BeOS R3.2 11/9/1998 7/1998 VSE/ESA 2.3.2 Windows NT 4.0 Windows CE 2.12 VxWorks RT-11 5.7 Service Pack 4 9/1998 29/10/1998 RSX-11S v4.8 RSX-11M v4.8 Windows CE 3.0 5/11/1998 6/11/1998 VxWorks AE BeOS R4 1999 OS/390 v2R7 IMS REAL/32 7.6 12/1998 1999 1/1999 RSX-11M+ v4.6 VSPWorks 10/2/1999 Micro/RSX v4.6 Palm OS 3.1 12/2/1999 Windows NT 1999 Embedded 4.0 BeOS R4.5 (Beta 1) 1999 22/2/1999 Caldera Thin Clients DrDOS 7.03 6/1999 RiscOS 4 EPOC 5 VSE/ESA 2.4 VM/ESA v2 R4 OS/390 v2R8 Lineo DrDos 7.03 6/1999 6/1999 BeOS R4.5.1 ChorusOS 4.0 6/1999 OS/400 v4R4 1999 6/1999 6/1999 6/1999 Lineo OEM DrDos 7.04 7/1999 21/5/1999 8/1999 Windows 98SE Integrity 2000 8/1999 Mac OS 9.0 Palm OS 3.2 VSE/ESA 2.4.1 28/9/1999 AmigaOS 3.5 Lineo DrDos 7.05 10/1999 1999? 1999 BeOS R4.5.2 10/1999 11/1999 1999? OS/390 v2R9 2000 12/1999 NetWare 5.1 2000 ReactOS 0.0.15 1/2000 VMS 7.3 1/2000 TPF v3R1 Windows 2000 RiscOS 5 2000 BelA PR BeOS R5 Free BeOS R5 Pro (NT 5) VSE/ESA 2.4.2 (Stinger) 3/2000 3/2000 2/2000

BeOS Max v3 OS/400 v4R5 ChorusOS 4.0.1 Mac OS 9.1 BelA 1.0 28/7/2000 2000 2000 ReactOS 0.0.16 pSOSystem 3 8/2000 7/2000 Integrity 3.0 VSE/ESA 2.5 Windows ME BelA 2.0 26/9/2000 9/2000 OS/390 v2R10 9/2000 Symbian 6 10/2000 11/2000? z/VM v3 R1 AmigaOS 3.9 Integrity-178B 2001 12/2000 12/2000 2001 z/OS v1R1 1/2001 ReactOS 0.0.17 VSE/ESA 2.5.1 2/2001 Symbian 6.1 FreeDOS Beta 6 2001? 3/2001 3/2001

z/VM v4 R1 OS/400 v5R1 NewOS 5/2001 25/5/2001 5/2001 - 2004 z/OS v1R2 Palm OS 3.3 ChorusOS 5.0 TPF v4R1 6/2001 2001? 2001 7/2002 VSE/ESA 2.5.2 z/VM v4 R2 ReactOS 0.0.18 FreeDOS Beta 7 8/2001 8/2001 8/2001 NetWare 6.0 OpenBeOS Windows XP eComStation OS/2 v1.0 9/2001 9/2001 (NT 5.1) 4/10/2001 BeOS R5.1 10/2001 11/2001 VSE/ESA 2.6 Windows XP 2002 12/2001 Embedded Windows CE .NET 2002 2001 7/1/2002 Symbian 7.0 VSE/ESA 2.6.1 2/2002 2002? ReactOS 0.0.19 Integrity 4.0 3/2002 FreeDOS Beta 8 13/3/2002 VSE/ESA 2.6.2 z/OS v1R3 Windows XP Tablet Ed 4/2002 2002? Copyright 2003,2004 6/2002 2002 Patrick J.C. Mulvany IMS REAL/32 7.93 6/2002 Mac OS 9.2 Palm OS 3.5 PhOS ReactOS 0.0.20 OS/400 v5R2 2002 2002? Beta 1 8/2002 30/8/2002 SkyOS 3.9.1d Device Logics 9/2002 VSE/ESA 2.6.3 PhOS ReactOS 0.0.21 DrDos 7.03 2002? SkyOS 3.9.5f Beta 2 10/2002 10/2002 11/2002 PhOS 2003 IMS REAL/32 7.94 Beta 3 2003 ReactOS 0.1.0 1/2003 2/2003 PhosphurOS Beta 4 VSE/ESA 2.7 ReactOS 0.1.1 NetWare 6.5 Symbian 7.0s 3/2003 3/2003 eComStation OS/2 v1.1 4/2003 4/2003 24/5/2003 z/VM v4 R4 z/OS v1R4 iRMX SkyOS 3.9.8 5/2003 5/2003 VMS 7.3-2 ReactOS 0.1.2 Windows 2003 (NT 5.2) 24/6/2003 6/2003 2003 7/2003 2003 SkyOS 4.0a ReactOS 0.1.3 8/2003 9/2003 VSE/ESA 2.7.1 ReactOS 0.1.4 9/2003 10/2003 ReactOS 0.1.5 z/OS.e 11/2003 2004 12/2003 iRMX III Zeta RC2 2004 OS/400 v5R3 ReactOS 0.2 RC1, RC2 1/2004 FreeDOS Beta 9 2004? 1/2004 2004 TBA? ReactOS 0.2 z/OS v1R5 1/2004 3/2004 ReactOS 0.2.1 3/2004 ReactOS 0.2.2 4/2004

z/OS v1R6 9/2004

2005

VSE/ESA 3.1 3/2005

VSE/ESA 3.1.1 z/OS v1R8 11/2005 9/2005

2006

VSE/ESA 3.1.2 6/2006

z/OS v1R8 9/2006

2007