Positive Level to Dec Level Receiver

This document is a technical schematic for the Digital Equipment Corporation (DEC) W591 Positive Level to DEC Level Receiver. The circuit is designed to interface incoming positive logic voltage levels (using common voltage rails of +5V, +10V, -3V, and -15V) and convert them to the DEC standard logic levels. The schematic details the arrangement of transistors (DEC 3009B and DEC 4258), diodes (D662 and D664), and various resistors used to construct the receiver circuit. It includes specifications for component values, such as 1/4W 5% resistors and .01 MFD capacitors, and provides a conversion chart for the internal DEC component parts to industry-standard (EIA) equivalents.