TSX-Plus Operating System

S & H Computers, Inc.

Excerpted from "TSX-Plus User's Reference Manual" 

   TSX-Plus  is a high performance operating system for Digital
Equipment Corporation PDP-11 and LSI-11  computers,  supporting
as  many  as  fourty  concurrent  time-sharing users.  TSX-Plus
provides a multi-user programming environment that is  similiar
to extended memory (XM) RT-11.  

      -  TSX-Plus  keyboard  commands are compatible with those
         of RT-11.  

      -  TSX-Plus  supports  most  RT-11  system  service calls

      -  Most  programs  that  run under RT-11 will run without
         modification  under  TSX-Plus.   This  includes  RT-11
         utility  programs  such  as  PIP,  DUP, DIR, LINK, and

      -  TSX-Plus uses RT-11 XM version device handlers.  

      -  TSX-Plus  provides  PLAS extended memory services such
         as virtual overlays and virtual  arrays,  as  well  as
         support for extended memory regions.  

   TSX-Plus  can  simultaneously support a wide variety of jobs
and programming languages includinf COBOL-Plus, FORTRAN, BASIC,
DIBOL,  Pascal, C, MACRO, IND, TECO, and KED.  TSX-Plus is used
in   education,   business,    scientific,    and    industrial
environments.   It  can  concurrently  support commercial users
doing  transaction  processing,  engineering  users  performing
scientific   processing,   system   programmers  doing  program
development, and real time process control.  Numerous  software
packages  compatible  with  TSX-Plus  are  available from other

   TSX-Plus  supports  RT-11 system service calls (EMTs) as its
basic mode of operation.  The result is low system overhead and
substantially  improved  performance  over systems that emulate
RT-11 services.  TSX-Plus overlaps terminal  interaction  time,
I/O  wait  time,  and  CPU  execution  time for all jobs on the

   In  addition  to  the  basic  RT-11  functionality, TSX-Plus
provides extended features such as:  process  windows;   shared
file record locking;  inter-job message communication;  program
performance monitoring;  command file  parameters;   logon  and
usage  accounting;   directory and data caching;  multitasking;
and system I/O buffering.  

   TSX-Plus  will  run  on  any  PDP-11 or LSI-11 computer with
memory management hardware and at least 128Kb of  memory.   The
system must also have a disk suitable for program swapping (the
swapping disk can be used for regular file  storage  as  well).
Time-sharing  lines and serial printers may be connected to the
system   through   DH(U,V,Q)-11,    DL(V)-11,    or    DZ(V)-11
communication devices.  Both hardwired and dial-up time-sharing
lines are supported by TSX-Plus.  

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Last Updated: June 2008