Bus Driver M623

This document is a technical schematic for the Digital Equipment Corporation (DEC) M623 Bus Driver module, dated 1968. The circuit utilizes DEC7402 integrated circuits (NOR gates) alongside DEC3009B transistors, D664 diodes, and various resistors and capacitors to drive signals. The diagram illustrates the wiring configuration for 12 transistors and their associated logic gates, providing power (+5V) and ground (GND) distribution. The document includes a comprehensive parts list, identifying the specific components and their respective DEC part numbers required for maintenance and repair.