Was (wer) ist PDP-20 - definition
TYPE OF MAINFRAME COMPUTER
DECsystem-20; DECSystem-20; PDP-20; DEC-20; DECSYSTEM 20; DECSYSTEM 2020; DECSYSTEM 2040
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.jpg?width=200 "2 DECSYSTEM-2020 KS-10s (1979) at the Living Computer Museum")
PDP-20
The most famous computer that never was. PDP-10 computers
running the TOPS-10 operating system were labelled
"DECsystem-10" as a way of differentiating them from the
PDP-11. Later on, those systems running TOPS-20 were
labelled "DECSYSTEM-20" (the block capitals being the result
of a lawsuit brought against DEC by Singer, which once made a
computer called "system-10"), but contrary to popular lore
there was never a "PDP-20"; the only difference between a 10
and a 20 was the operating system and the colour of the
paint. Most (but not all) machines sold to run TOPS-10 were
painted "Basil Blue", whereas most TOPS-20 machines were
painted "Chinese Red" (often mistakenly called orange).
[Jargon File ]
(1994-12-21)
Programmed Data Processor
![digitizing tablet]]](https://commons.wikimedia.org/wiki/Special:FilePath/PDP-15 graphics terminal.agr.jpg?width=200 "digitizing tablet]]")
SERIES OF MINICOMPUTERS MADE AND MARKETED BY THE DIGITAL EQUIPMENT CORPORATION FROM 1957 TO 1990
Programmable Data Processor; PDP-3; PDP 3; PDP-2; PDP 2; PDP 4; PDP 9; PDP 12; PDP 14; PDP 15; PDP 16; DEC PDP; PDP-H; DEC PDP-H
Programmed Data Processor (PDP), referred to by some customers, media and authors as "Programmable Data Processor,"
Programmed Data Processor
SERIES OF MINICOMPUTERS MADE AND MARKETED BY THE DIGITAL EQUIPMENT CORPORATION FROM 1957 TO 1990
Programmable Data Processor; PDP-3; PDP 3; PDP-2; PDP 2; PDP 4; PDP 9; PDP 12; PDP 14; PDP 15; PDP 16; DEC PDP; PDP-H; DEC PDP-H
<computer> (PDP) Early (1960's?) {Digital Equipment
Corporation} family of minicomputers. The best known ranges
were the PDP-10 and PDP-11. PAL was the {assembly
language}.
(1997-11-21)
Wikipedia
DECSYSTEM-20
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The DECSYSTEM-20 was a 36-bit Digital Equipment Corporation PDP-10 mainframe computer running the TOPS-20 operating system (products 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. Later on, those systems running TOPS-20 (on the KL10 PDP-10 processors) were labeled DECSYSTEM-20 (the block capitals being the result of a lawsuit brought against DEC by Singer, which once made a computer called "The System Ten"). The DECSYSTEM-20 was sometimes called PDP-20, although this designation was never used by DEC.
