Plotter Control M704

Summary: This document is a technical circuit schematic for the M704 Plotter Control unit, manufactured by Digital Equipment Corporation. The diagram details the logic design, including the arrangement of transistors (DEC3009B), integrated circuits (various 7400-series TTL chips), resistors, and capacitors. The schematic illustrates the control flow for plotter functions such as pen movement (up/down, left/right) and drum rotation, along with associated interrupt and status signaling logic. It also includes standard engineering notes regarding component specifications and power distribution (+5V, -15V).