< Evolution of Operating Systems Designs

CP derivatives

  1. CP
  2. CP-VM
  3. CP/M
    1. CP/M-86
      1. DOS
      2. DRDOS
        1. FreeDOS
  4. Microsoft Windows
    1. Windows 3.x
    2. Windows 95/98/Me
    3. See NT-based versions below

MULTICS derivatives

  1. UNIX
    1. Unix V5 (SCO Unix)
    2. Modern Unix (Solaris / BSD)
      1. FreeBSD
      2. OpenBSD
    3. Xenix
    4. Linux
    5. Plan 9
      1. Inferno
    6. QNX
    7. VSTa
    8. Mac OSX
    9. MIPS RISC/os
    10. RISC iX

VMS derivatives

  1. VMS
    1. OpenVMS
  2. OS/2
    1. eComStation
  3. Microsoft Windows NT-based
    1. Windows NT
    2. Windows 2000
    3. Windows XP
    4. Windows Vista
    5. Windows 7
    6. Windows 8 (and 8.1)
    7. Windows 10
    8. ReactOS (clone of Windows NT-based, not from Microsoft)

MacOS derivatives

  1. Mac OS
    1. Mac OS 9

Cambridge CAP Computer derivatives

  1. KeyKOS
    1. EROS
      1. Coyotos
      2. CapROS

IBSYS derivatives

  1. OS/360
  2. OS/400

AmigaOS derivatives

  1. AmigaOS
  2. AROS
    1. AmigaOS 4.x
    2. MorphOS

Misc. operating systems

  1. Grasshopper
  2. ITS
  3. BeOS
  4. RISC OS
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