4x9 Data Mixer M174

This document is a technical schematic for a 4x9 Data Mixer (Model M174) manufactured by Digital Equipment Corporation in 1968.

The schematic details the logic circuitry, which utilizes multiple integrated circuits (labeled E1 through E9) to process data signals (AAI through BCI). The diagram illustrates the wiring connections for these components, including power supply inputs (+5V and +3V), grounding, and various decoupling capacitors. The document also includes a comprehensive parts list, identifying the specific resistors, capacitors, integrated circuits (DECIOMHSS), and physical components (such as flip-chip handles and the etched circuit board) required for the assembly.