Diode Gate S123

This document is a technical schematic from 1967 for a "Diode Gate S123" circuit designed by the Digital Equipment Corporation. It outlines the wiring diagram for six identical gate circuits, each utilizing a DEC3639 transistor, two 100,000-ohm resistors, one 7,500-ohm resistor, and a series of D662 diodes. The schematic specifies that it is for test and maintenance purposes, notes the components used, and indicates that the circuit is intended to be used on the W101 etch board. A transistor and diode conversion chart is also included for cross-referencing components.