Gate Expander K026

This document is a technical schematic for the Digital Equipment Corporation (DEC) Gate Expander K026, dated 1968. The circuit consists of a network of 18 diodes (D1–D18) and 6 resistors (R1–R6, 4.7K, 1/4W, 10% CC). The schematic details the wiring connections for the gate expander's inputs and outputs, and includes a parts list identifying the components used, as well as a transistor and diode conversion chart indicating the use of D600/1N4009 diodes.