DIODE GATE B163

This document is a proprietary schematic diagram for a "DIODE GATE B163" circuit, copyrighted by Digital Equipment Corporation in 1966 and intended for test and maintenance. The circuit features six identical gate stages (Q1-Q6) each built around a 2N4258 transistor, with associated input diodes (primarily D-662), 68,000 Ohm resistors, and 0.01 MFD capacitors. Various input lines are present (D, E, F, K, L, M, R, S, T), and the circuit operates with +10V, -15V, and -3V STRATE power supplies, along with a ground reference. General specifications indicate resistors are 1/4W, 5%, and diodes are D-664 (unless otherwise specified). A conversion chart for DEC and EIA transistor (2N4258) and diode (D662/IN645, D664/IN3606) types is also provided.