Reader Control

This document is a technical schematic for a "Reader Control" circuit board (part number M7050-0-1) designed by Digital Equipment Corporation.

The schematic details the logic and signal routing required to interface with external devices (such as a paper tape reader). Key components and features include:

• Logic Gates and Integrated Circuits: The circuit utilizes various standard logic gates (represented by E1 through E19) to process signals such as "Stop Complete," "Run Flag," "Shift," and "Initialize."
• I/O Bus Interface: The circuitry manages the flow of information between the device and the system I/O bus (designated as I/O BUS IN 1 through IN 10).
• Control Signals: It includes specific control logic for "On/Off Line" status, "Stop Delay," and "Inhibit Strobe."
• Power and Support Components: The diagram includes power distribution rails (+5V and +3V), various resistors, capacitors, and a transistor/diode conversion chart to facilitate maintenance and testing.
• Operational Notes: The document specifies that it is for test and maintenance purposes and lists the specific IC types used throughout the design, such as DEC 74xx series logic.