What Have We Learned from the PDP-11

This document provides a historical and technical review of the PDP-11 computer family, written by C. Gordon Bell. It covers the initial design philosophy, the challenges faced by the engineering teams, and the evolution of the hardware and architecture over its first six years (1970-1975). Key topics include the importance of the UNIBUS, the challenges of achieving a broad product range, the impact of semiconductor memory technology on design decisions, and lessons learned regarding architectural planning, multiprocessor implementation, and system performance.