The PDP-7 is an 18-bit minicomputer produced by Digital Equipment Corporation as part of the PDP series.

Input/output (I/O) includes a keyboard, printer, punched tape and dual transport DECtape drives (type 555).

[8] In 1969, Ken Thompson wrote the first UNIX system, then named Unics as a pun on Multics despite only using two design elements from Multics,[9][10] in assembly language on a PDP-7,[11] as the operating system for Space Travel, a game which requires graphics to depict the motion of the planets.

[3]: p.8  A DEC publication states that the first units shipped to customers in November 1964.

[13] A PDP-7A (serial number 115) was under restoration in Oslo, Norway;[14] a second PDP-7A (serial number 113) previously located at the University of Oregon in its Nuclear Physics laboratory is now at the Living Computer Museum in Seattle, Washington and is completely restored to running condition after being disassembled for transport;[15] Another PDP-7 (serial number 47) is known to be in the collection of Max Burnet near Sydney, Australia, a fourth PDP-7 (serial number 33) is in storage at the Computer History Museum in Mountain View, California and a fifth PDP-7 (serial number 129) belonging to Fred Yerian is also located at the Museum, and has been demonstrated running Unix version 0 and compiling a B program.