DECSYSTEM-20

DECSYSTEM-20
DECSYSTEM-20 KL-10 (1974) at the Living Computer Museum
Also known asPDP-20
DeveloperDigital Equipment Corporation
Product familyProgrammed Data Processor
TypeMainframe computer
Release date1977; 47 years ago (1977)
Operating systemTOPS-20
PlatformDEC 36-bit
RelatedPDP-10
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.

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,[citation needed] which once made a computer called "The System Ten").[1] The DECSYSTEM-20 was sometimes called PDP-20, although this designation was never used by DEC.

  1. ^ "Singer System 10". Computerworld. March 21, 1977. p. 75.