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What (who) is DEC-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)
DEC PRISM
Parallel Reduced Instruction Set Machine; MicroPRISM; DEC Prism
PRISM (Parallel Reduced Instruction Set Machine) was a 32-bit RISC instruction set architecture (ISA) developed by Digital Equipment Corporation (DEC). It was the outcome of a number of DEC research projects from the 1982–1985 time-frame, and the project was subject to continually changing requirements and planned uses that delayed its introduction.
DEC Special Graphics
Code page 1090; DEC Special; DEC-SPECIAL; Dec-special
DEC Special Graphics is a 7-bit character set developed by Digital Equipment Corporation. This was used very often to draw boxes on the VT100 video terminal and the many emulators, and used by bulletin board software.
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.
Examples of use of DEC-20
1. Dec. 20, 1'73 – ETA kills the prime minister, Adm.
2. Lubyanka). Related Article Must–Haves – Not (Dec. 20, 2006) «
3. House leaders intend to adjourn for the year by Dec. 20.
4. Phillips is expected to spend his life in prison after sentencing Dec. 1' and Dec. 20.
5. But you‘ll have to book quickly, as the offer ends Thursday, Dec. 20.