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Computing (FOLDOC) dictionary
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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).