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PDP-10 systems on the ARPANET highlighted in yellow. Digital Equipment Corporation (DEC)'s PDP-10, later marketed as the DECsystem-10, is a mainframe computer family [1] manufactured beginning in 1966 [2] and discontinued in 1983.
The PDP-6 Monitor software was first released in 1964. Support for the PDP-10's KA10 processor was added to the Monitor in release 2.18 in 1967. The TOPS-10 name was first used in 1970 for release 5.01. Release 6.01 (May 1974) was the first TOPS-10 to implement virtual memory (demand paging), enabling programs larger than physical memory to be ...
When encoding strings in the PDP-11 assembler and other PDP-11 programming languages the code points represent the $, ., % characters, and are encoded as such with the default RAD50 macro in the global macros file, and this encoding was used in the symbol tables.
The PDP-10 was widely used in university settings, and thus was the basis of many advances in computing and operating system design during the 1970s. DEC later re-branded all of the models in the 36-bit series as the "DECsystem-10", and PDP-10s are generally referred to by the model of their CPU, starting with the "KA10", soon upgraded to the ...
DECSYSTEM-2020 front panel 2 DECSYSTEM-2020 KS-10s (1979) at the Living Computer Museum. The DECSYSTEM-20 was a family of 36-bit Digital Equipment Corporation PDP-10 mainframe computers running the TOPS-20 operating system and was introduced in 1977.
Since it included no control characters, not even end-of-line, it was not used for general text processing. However, six-character names such as filenames and assembler symbols could be stored in a single 36-bit word of the PDP-10, and three characters fit in each word of the PDP-1 and two characters fit in each word of the PDP-8. See table below.
The local spelling "TURIST" is an artifact of six-character filename (and other identifier) limitations, which is traceable to six SIXBIT encoded characters fitting into a single 36-bit PDP-10 word. "TURIST" may also have been a pun on Alan Turing, a pioneer of theoretical computer science. [11]
There are two systems for handling ASCII text. ASCII files are stored as three 8-bit characters per pair of 12-bit words. The first two characters (marked with bits a0–a7 and b0–b7 below) are stored whole in their words, while the third character (bits c0–c7) is stored with half of its bits in word 1 and the other half in word 2. [7]