Date: Tue Aug 15 15:14:00 EDT 1995
X-Version: 2.9

6.7)  Real-time Unices.

      WARNING: this section is badly in need of work. It's full of errors,
      and it's incomplete. I hope to have time to look at it this winter
      (was "this fall"). I doubt all of following are Unices -- input is
      welcome. The list also includes more common Unices with real-time
      features, and some non-Unix systems with Unix-like APIs. I don't
      suppose the latter really belong here, but having collected some notes,
      I'm hesitant to junk them. See also comp.realtime.

      AIX: AIX/6000 has real-time support.

      Concurrent OS (Concurrent): real Unix, significantly modifed by
         Concurrent.

      CX/UX: a real UNIX significantly modified by Harris to provide
         real-time capabilities and performance. Compliant with POSIX.4 final
         version.

      EP/LX (Control Data): port of LynxOS to R3000. Formerly called TC/IX.

      LynxOS (Lynx Real-Time Systems, Inc): Berkeley and SV compatibility,
         ground-up rewrite (proprietary), predates SVR4. Is not UNIX, but
         supports much of the UNIX I/Fs (SV and BSD). POSIX compliant. Fully
         preemptive, fixed priorities.

      MiX: microkernel implementation of SVR4 offered by Chorus.

      Motorola SVR4 has real-time capabilities.

      QNX (Quantum Software): unix-compatible real real-time OS.

      REAL/IX: based on System V 3.2 with RT features (fully premptive kernel,
         fixed-priority scheduler, RT timer, &c.). For 68xxx and 88xxx based
         systems. POSIX (1003.1 - 1988) compliant and in 88k form, it is
         88open BCS compliant. Also available for x86/Pentium.

      RTMX O/S [RTMX Incorporated]: elements of NET2, 4.4BSD-Lite and
         proprietary code. Also includes FSF tools. Real-time (POSIX)
         extensions.

      RTU (Concurrent), for 68K boxes

      Solaris 2 has real-time capabilities?

      Stellix (Stardent); it's Unix, but is it real-time?

      Venix/386: Interactive SVR3.2 with real-time extensions.

      VMEexec (Motorola): not Unix, but also shares some I/Fs with Unix.

      VxWorks (Wind River Systems): Little in common with Unix, has some I/Fs
         in common with Unix (but not the file system). Newsgroup:
         comp.os.vxworks.

        (know nothing about)

      Convex RTS

      REAL/IX (AEG)

      Sorix (Siemens)

      System V/86 (Motorola)

      TC/IX (CCD)

      Velocity (Ready Systems):