TOPS-20

Rarity: Common

The most frequent rarity: most Wikipedia articles become Commons.

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At a glance

Class

Invention

Domain

Science and technology

Knowledge cost

1

In collections

Nobody has pulled it yet.

What Wikipedia says

The TOPS-20 operating system by Digital Equipment Corporation (DEC) is a proprietary OS used on some of DEC's 36-bit mainframe computers. The Hardware Reference Manual was described as for "DECsystem-10/DECSYSTEM-20 Processor" (meaning the DEC PDP-10 and the DECSYSTEM-20).

Excerpt from the Wikipedia article “TOPS-20”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: DEC, CC BY-SA 3.0, via Wikimedia Commons.