2 Decoders M151

This document is a technical schematic and parts list for a "2 Decoders M151" circuit module, manufactured by Digital Equipment Corporation in 1970.

Summary:

• Circuit Function: The schematic details the wiring logic for two decoders, utilizing DEC1074H20 integrated circuits to process enable signals and inputs. It includes logic gates (E9) and various pull-up resistors to manage signal flow.
• Components: The parts list specifies the required hardware, including 9 integrated circuits, various resistors and capacitors, an etched circuit board, and a handle.
• Specifications: It notes that unless otherwise indicated, capacitors are .01uF (100V, 20%), resistors are 1/4W (10%), and IC pin 14 is tied to +5V while pin 7 is tied to ground. It also specifies that pins F2 and U1 are reserved for backplane twisted-pair grounds and should not be used for other connections.