Synchronous Modem Interface

This document details the Synchronous Modem Interface (DP8-EA/EB), a hardware component designed for the PDP8/E. It covers:

• System Description: How the DP8 handles modem control, parallel-to-serial data conversion, and character detection.
• Specifications: Details on data transfer rates, character parameters, and interface compatibility (Bell 201, 301, and 303 series modems).
• Programming: A comprehensive guide to bit assignments, status registers, and instruction sets.
• Technical Details: Jumper selection guides for configuration, pin assignments for connectors, and detailed engineering schematics.
• Maintenance: Test procedures and diagnostic tools for the interface.