Minicomputer PDP-8 of the Digital Equipment Corporation (DEC)

With about 50,000 units sold, the PDP-8 was the first successfully sold minicomputer that didn’t fill an entire room, but only a cabinet. From 1965 onwards, smaller companies also acquired the “Programmed Data Processor” from Digital Equipment Corporation (DEC) at a low price of $18,000. The 12-bit computer was programmed in assemblers, BASIC and Fortran — 4096 storage spaces were available to the computer. An operating system did not yet exist for the transistor computer. In 1970 DEC established the successor PDP-11, on which Unix was further developed — the PDP-8 ran parallel for 9 years until 1979.

Summaries, sources: Heise, http://www.pdp8.net/