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DECSYSTEM-20
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{{Short description|Type of mainframe computer}} {{Infobox information appliance | name = DECSYSTEM-20 | title = | aka = PDP-20 | logo = DECSYSTEM-20 wordmark.svg | logo caption = | image = DECSYSTEM-20 KL-10 (1974).jpg | image_size = | caption = DECSYSTEM-20 KL-10 (1974) at the [[Living Computer Museum]] | developer = [[Digital Equipment Corporation]] | manufacturer = | family = [[Programmed Data Processor]] | type = [[Mainframe computer]] | generation = | releasedate = {{Start date and age|1977}} | lifespan = | price = | discontinued = | unitssold = | unitsshipped = | media = | os = [[TOPS-20]] | power = | soc = | cpu = | memory = | storage = | memory card = | display = | graphics = | sound = | input = | controllers = | camera = | touchpad = | connectivity = | platform = DEC 36-bit | service = | dimensions = | weight = | topgame = | compatibility= | predecessor = | successor = | related = [[PDP-10]] | website = }} [[File:DECsystem 2020 Logo.jpeg|thumb|DECSYSTEM-2020 front panel]] [[File:DECSYSTEM-2020 KS-10 (1979).jpg|thumb|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 computer]]s 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]]. 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 [[Digital Equipment Corporation|DEC]] by [[Singer Corporation|Singer]],{{citation needed|date=November 2019}} which made its own [[Singer System Ten|System Ten]] model, occasionally referenced in reporting as the "System 10"<ref>{{cite magazine | url=https://archive.org/details/sim_computerworld_1970-04-08_4_14/mode/1up | title=Friden System Can Multiprogram 20 Jobs Through Hardware Control | magazine=[[Computerworld]] | last1=Lundell | first1=Drake | last2=Piasta | first2=Frank | date=8 April 1970 | pages=1,4 }}</ref>). The DECSYSTEM-20 was sometimes called '''PDP-20''', although this designation was never used by DEC.
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