TWO BUS DRIVERS B684

This document is a proprietary electrical schematic from Digital Equipment Corporation, copyrighted in 1964, illustrating two "Bus Drivers B684" circuits. The schematic details the interconnection of various electronic components, including transistors (Q1-Q8), numerous diodes (D1-D24), resistors (R1-R30), and capacitors (C1-C11), arranged in a largely symmetrical dual-channel driver configuration. It provides a comprehensive parts list with reference designations, component descriptions (e.g., resistor values, transistor types, capacitor values), and corresponding part numbers. Additionally, a transistor and diode conversion chart is included. The document explicitly states it is furnished for test and maintenance purposes.