PDP-20

	This is the JargonFile ^(V4.00) entry for PDP-20 - Next: peek, Prev: PDP-10
:PDP-20: /n./ The most famous computer that never was. 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 were labeled 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 color 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).
* (text is auto-included via JargonExtension by mutante using jargon with VERSION 4.0.0, 24 JUL 1996* - JargonFile by Eric S. Raymond is in the public domain)*