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The DEC PDP-7 is a minicomputer produced by Digital Equipment Corporation. Introduced in 1965, with a cost of only US-$ 72,000, this computer was very cheap, but quite powerful. The PDP-7 is an 18-bit architecture.

In 1969, Ken Thompson wrote the first UNIX system in assembly language on a PDP-7, then named Unics as a somewhat treacherous pun on Multics.

There are a few remaining PDP-7 still in operable condition, and an interesting restoration project in Oslo, Norway.

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