HALF BINARY TO OCTAL DECODER B156

This document is a schematic diagram for a Half Binary to Octal Decoder, identified as B156. It outlines the circuit design, which includes four transistors (Q1-Q4), multiple diodes (D1-D32), resistors (R1-R13), and capacitors (C1-C3). The schematic shows various input and output points labeled with letters and numbers, along with power connections for A+10V, -15V, and -3V. An "ENABLE" input is also present. General specifications indicate that resistors are typically 1/4W, 10%, diodes are D-664, and transistors are 2N4258, unless specified otherwise. A "TRANSISTOR & DIODE CONVERSION CHART" provides equivalent EIA part numbers for the specified components. The document is proprietary to Digital Equipment Corporation, copyrighted 1966, and is intended for test and maintenance purposes.