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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. PDP-10 computers running the TOPS-10 operating system were labeled DECsystem-10 as a way of differentiating them from the PDP-11 .
DECsystem was a line of server computers from Digital Equipment Corporation.They were based on MIPS architecture processors and ran DEC's version of the UNIX operating system, called ULTRIX.
When DEC cancelled the Jupiter project in 1983, Systems Concepts hoped to sell their machine to customers with a software investment in PDP-10s. Their spring 1984 announcement generated excitement in the PDP-10 world. TOPS-10 was running on the Mars by the summer of 1984, and TOPS-20 by early fall. However, people at Systems Concepts were ...
Panda Programming TOPS-20 page; Online PDP-10 and related systems at SDF's Interim Computer Museum (includes some systems that were originally part of the Paul Allen collection at Living Computers: Museum + Labs). Empire for the PDP-10 (zip file of FORTRAN-10 source code download) from Classic Empire; PDP-10 software archive at Trailing Edge
TOPS-20 was based upon the TENEX operating system, which had been created by Bolt Beranek and Newman for Digital's PDP-10 computer. After Digital started development of the KI-10 version of the PDP-10, an issue arose: by this point TENEX was the most popular customer-written PDP-10 operating systems, but it would not run on the new, faster KI-10s.
The use of RADIX 50 was the source of the filename size conventions used by Digital Equipment Corporation PDP-11 operating systems. Using RADIX 50 encoding, six characters of a filename could be stored in two 16-bit words, while three more extension (file type) characters could be stored in a third 16-bit word.
It was first implemented on the PDP-6 architecture by Harrison "Dit" Morse early in the 1960s. It was subsequently implemented for DEC's operating systems for PDP-10, PDP-11, and PDP-8 [1] architectures. In the 1970s and 1980s Digital Research implemented PIP on CP/M [2] and MP/M. [3]
MACRO-10 is an assembly language with extensive macro facilities for DEC's PDP-10-based Mainframe computer systems, the DECsystem-10 and the DECSYSTEM-20. MACRO-10 is implemented as a two-pass assembler .