The PDP-15 was an 18-bit minicomputer by Digital Equipment Corporation that first shipped in February 1970. It was the fifth and last of DEC's 18-bit machines, a series that had started in December 19
An incomplete PDP-15
PDP-15 graphics terminal with light pen and digitizing tablet
Digital Equipment Corporation, using the trademark Digital, was a major American company in the computer industry from the 1960s to the 1990s. The company was founded by Ken Olsen and Harlan Anderson
Assabet Woolen Mill, headquarters of Digital Equipment Corporation from 1957 to 1992
DEC was headquartered at a former wool mill in Maynard, Massachusetts, from 1957 until 1992.
System Building Blocks (System Module) 1103 hex-inverter card (both sides)
PDP-1 System Building Block #4106, circa 1963 - note that one transistor (yellow) has been replaced