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     MACHINE(HW)              XENIX System V               MACHINE(HW)



     Name
          Machine - Description of host machine.

     Description
          This page lists the internal characteristics of personal
          computers which use the Intel 8086 processor family and its
          associated hardware.  The information is intended for
          software developers who wish to transfer relocatable object
          or executable files from other XENIX machines to a personal
          computer then prepare the files for execution on the
          personal computer.


       Central Processing Unit      Intel 8086, 8088, 80186, 80286, 80386

       Disk Block Size (BSIZE)      1024 bytes

       Memory Management Scheme     Unmapped (8086, 8088, 80186)
                                    Segmented (80286)
                                    Segmented and paged (80386)

       Split Instruction and Data   Supported

       Variable Stack Size          Supported (8086, 80386 only)
                                    (8086, 80386 default configuration)

       Fixed Stack Size             Supported
                                    (80286 default configuration)

       Clock Ticks                  .05 second (8086, 8088, 80186)
                                    .02 second (80286, 80386)

     Binary Compatibility
          The small and middle model binary programs created by the C
          compiler cc(CP) run on many processors. The following chart
          shows which  systems running on which processors produce
          code executable on other machines.  It is assumed that
          system specific system calls are not used to produce
          portable code.  cc(CP) produces code by default, but can
          also be used as a cross development compiler, by using the
          appropriate flags.

          SCO-nn is  distributed by The Santa Cruz Operation, Inc.
          MS-nn is  distributed by Microsoft Corporation.  Intel  is
          distributed by Intel Corporation.  Altos  is distributed by
          Altos Computer Systems.  nn designates the machine
          processor.  System designates the version of , either 2.3,
          3.0, or System V.







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     MACHINE(HW)              XENIX System V               MACHINE(HW)



     ______________________________________________________________________________________________
                                          Binary Compatibility
     ______________________________________________________________________________________________
      Your                      Default compiler       Runs default               Compiles (cross
                                produces programs      programs                   development)
      System                    which run on           created on                 programs for
      Processor                 System/Processor       System/Processor           System/Processor
     ______________________________________________________________________________________________
      SCO-86 3.0                SCO-86 [3.0, Sys V]    SCO-86 3.0                 DOS*
                                SCO-186 [3.0, Sys V]   SCO-186 3.0
                                SCO-286 SysV           Intel, Altos-86 2.3, 3.0
     ______________________________________________________________________________________________
      SCO-86 SystemV            SCO-86 Sys V           SCO-86 [3.0, Sys V]        MS-286 3.0-
                                SCO-186 Sys V          SCO-186 [3.0, Sys V]       DOS*
                                SCO-286 Sys V          SCO-286 Sys V
                                MS-286 Sys V           Intel, Altos-86 2.3, 3.0
     ______________________________________________________________________________________________
      SCO-186 3.0               SCO-86 [3.0, Sys V]    SCO-86 3.0                 DOS*
                                SCO-186 [3.0, Sys V]   SCO-186 3.0
                                SCO-286 Sys V          Intel, Altos-86 2.3, 3.0
     ______________________________________________________________________________________________
      SCO-186 System V          SCO-86 Sys V           SCO-86 [3.0, Sys V]        MS-286 3.0-
                                SCO-186 Sys V          SCO-186 [3.0, Sys V]       DOS*
                                SCO-286 Sys V          SCO-286 Sys V
                                MS-286 Sys V           Intel, Altos-86 2.3, 3.0
     ______________________________________________________________________________________________
      SCO-286 3.0               SCO-286 [3.0, Sys V]   SCO-286 3.0                DOS*
                                MS-286 [3.0-, Sys V]   MS-286 3.0-
     ______________________________________________________________________________________________
      SCO-286 System V          SCO-86 Sys V           SCO-86 [3.0, Sys V]        SCO-286 3.0
                                SCO-186 Sys V          SCO-186 [3.0, Sys V]       MS-286 3.0-
                                SCO-286 Sys V          SCO-286 [3.0, Sys V]       DOS*
                                MS-286 Sys V           MS-286 [3.0-, Sys V]
     ______________________________________________________________________________________________
      SCO-386 System V          SCO-86 Sys V           SCO-86 [3.0, Sys V]        SCO-286 3.0
                                SCO-186 Sys V          SCO-186 [3.0, Sys V]       MS-286 3.0-
                                SCO-286 Sys V          SCO-286 [3.0, Sys V]       DOS*
                                SCO-386 Sys V          SCO-386 [Sys V]
                                MS-286 Sys V           MS-286 [3.0-, Sys V]
                                MS-386 Sys V           MS-386 [Sys V]
     ______________________________________________________________________________________________
      MS-286 3.0-               MS-286 [3.0-, Sys V]   SCO-286 3.0                DOS*
                                SCO-286 Sys V
     ______________________________________________________________________________________________
      MS-286 System V           MS-286 Sys V           SCO-86 [3.0, Sys V]=       DOS*
                                SCO-286 Sys V          SCO-186 [3.0, Sys V]=
                                                       SCO-286 [3.0, Sys V]=
     ______________________________________________________________________________________________
      MS-386 System V           MS-386 Sys V           SCO-86 [3.0, Sys V]=       DOS*
                                SCO-386 Sys V          SCO-186 [3.0, Sys V]=
                                                       SCO-286 [3.0, Sys V]=
                                                       SCO-386 [Sys V]=



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     MACHINE(HW)              XENIX System V               MACHINE(HW)



     ______________________________________________________________________________________________
                          |                         |                          |
          *  MS-DOS for i8086/8088, i80186 and i80286 processors.              |
          -  MS-286 3.0  is equivalent to Intel 286 3.0 .                      |
          =  untested, pending release of this product.                        |
                          |                         |                          |
     See also             |                         |                          |
          clockrate(HW), cc(CP), ld(CP), a.out(F).















































     Page 3                                           (printed 8/7/87)



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