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TSX-Plus is a multi-user operating system for the PDP-11/LSI-11 series of computers. It was developed by S&H Computer Systems, Inc. and is based on DEC's RT-11 single-user real-time operating system (TSX-Plus installs on top of RT-11). The system is highly configurable and tunable.[citation needed]

Due to the constraints of the memory management system in the PDP-11/LSI-11, the entire operating system core must occupy no more than 40 kibibytes of memory, out of a maximum possible 4 mebibytes of physical memory that can actually be installed in those machines (mandated by the 22-bit address space). Despite these limitations, TSX-Plus is actually able to service up to about 30 simultaneous users while still maintaining decent response times.[citation needed]

The software included a WP package named Lex-11[1] and a spreadsheet from Saturn Software. The machine slowed considerably if more than 8 students wanted to use the word-processing package at the same time. There was also a decision-table language called "D" from the NCC in Manchester which worked very well on TSX Plus.

The system was popular in the 1980s, although had a major number of clones. The latest version of TSX-Plus has TCP/IP support. The system is still in use and supported.

External links[edit]


  1. ^ See Tom Barnard and Ace Microsystems, Australia. New Scientist, 5 May 1983, Vol 98, No 1356, in Google Books.

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/TSX-Plus — Please support Wikipedia.
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6 news items

Market Realist
Mon, 28 Apr 2014 11:51:05 -0700

Natural gas prices closed at $4.65 per MMBtu for the week ended April 25, 2014—2% lower than the $4.74 per MMBtu close the prior week. One of the major factors for the decline in natural gas prices during the week was a bearish report from the U.S. ...
Market Realist
Mon, 28 Apr 2014 11:48:36 -0700

On April 25, the price of the WTI crude front month contract closed at $100.60 per barrel, 3% lower than the $104.30 per barrel close the week prior. The drop in prices was partly because the market experienced a larger-than-expected inventories build, ...
Market Realist
Mon, 28 Apr 2014 11:48:02 -0700

However, the spread has been narrowing over the past few months, as new infrastructure opened up that transports more crude from Cushing to the Gulf Coast, primarily the Marketlink pipeline operated by TransCanada (TSX). Plus, Enterprise Products ...
Southgate News Herald
Mon, 18 Feb 2013 04:15:24 -0800

The proposed plan was to buy TSX and the land to the south and put a full-size soccer field under an air-supported structure behind the TSX, plus a 98-room hotel, family entertainment center and restaurant on the city-owned land. JRV paid $182,000 to ...
CNW Telbec (Communiqué de presse)
Tue, 01 Oct 2013 06:15:23 -0700

Les actions de Jovian devraient être retirées de la liste des titres négociés sur le TSX plus tard cette semaine. En outre, Jovian a l'intention de présenter une demande aux organismes de réglementation des valeurs mobilières des provinces pertinentes ...
Thu, 18 Sep 2008 03:09:26 -0700

Pour ne rien gâcher, elle reçoit une mécanique K24 emprunté à une Acura TSX (plus communément appelée Accord chez nous) et préparée en long en large et en travers pour une puissance finale de 311 chevaux à la roue. Mesurée désormais a 774 kilos ...

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