Disc Writer G294

This document is a technical schematic for the Digital Equipment Corporation (DEC) Disc Writer G294 circuit board, dated 1969. The schematic details the electronic signal flow from two DEC 7420 integrated circuits through a series of transistors (DEC 6534C), diodes (D662), and various resistors and capacitors to the output heads. The document includes a conversion chart for the transistors and diodes, as well as general specifications for the components used on the board.