Tijuana is located in Brazil.
TSX-Plus is a multi-user operating system for the PDP-11  /  LSI-11 series of computers .. multi-user. multi-user. operating system. operating system. PDP-11. PDP-11. LSI-11. LSI-11. It was developed by S&H Computer Systems , Inc. and is based on DEC 's RT-11 single-user real-time operating system -LRB- TSX-Plus installs on top of RT-11 -RRB- .. operating system. operating system. DEC. Digital Equipment Corporation. RT-11. RT-11. real-time operating system. real-time operating system. The system is highly configurable and tunable .. 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 -LRB- mandated by the 22-bit address space -RRB- .. operating system. operating system. PDP-11. PDP-11. LSI-11. LSI-11. physical memory. primary storage. address space. address space. Despite these limitations , TSX-Plus is actually able to service up to about 30 simultaneous users while still maintaining decent response times , although it usually never is used for more than 8 simultaneous users .. The software included a WP package named Lex-11 and a spreadsheet from Saturn Software .. Saturn Software. 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 .. TCP / IP. Internet protocol suite. The system is still in use and supported .