M763

This document is a circuit schematic for the Digital Equipment Corporation (DEC) M763 Write Buffer, copyrighted in 1970. It is explicitly stated that the schematic is for test and maintenance purposes only and contains proprietary circuit information.

The circuit primarily utilizes various DEC logic integrated circuits (E1-E13), including:

• DEC 7473 (E3, E4, E5, E7, E9)
• DEC 6380 (E2, E4, E6, E8, E10)
• DEC 7474 (E12)
• DEC 74164 (E13)
• DEC 7400 (E11)

These logic gates are combined with supporting discrete components such as resistors (e.g., 680, 1K, 4.7K ohms), capacitors (e.g., 220pF, 0.1uF), and diodes (D664, 1N746A).

The write buffer appears to handle multiple data bits (indicated by inputs like BWD0 through BWD7 and corresponding outputs like WB0H/L, WB1H/L). Key control signals include "CLEAR," "CLOCK L," "WRITE STROBE H," and "WB SET ENBL H." The schematic also features several switches (SW0-SW7) for potential data routing or configuration.