M750

This document is an electrical schematic titled "LINE I/O CONTROL M750," designed by Digital Equipment Corporation in 1968. It illustrates a digital control circuit intended for managing multiple input and output lines, likely within a computer or peripheral system.

The circuit primarily utilizes standard integrated circuits of the TTL/DTL family, including various NAND gates (DEC7402N, DEC74H00N, DEC7440N) for combinatorial logic and D-type flip-flops (DEC7474N) for state control and data latching. It features input sections with filtering and buffering (e.g., "FILTER A," "FILTER B," "INVERTER A/B IN"), several control and data inputs like "LINE A/B," "GROOP," "HO," "MI," "LOAD F," "LOAD LH," and "INITIALIZE."

Output signals include "LINE OUT," "DATA OUT A/B," "INVERTER A/B OUT," "LHS (1)," and "LINE MVX OUT." Transistors (DEC3009B-S) are employed as output drivers to provide sufficient current for external loads. The schematic also details power supply filtering for +3.5V and +5V rails using resistors, diodes, and capacitors, and specifies standard power connections for the integrated circuits.