DECtape Control

This manual provides comprehensive technical information for the Type 552 DECtape Control, which facilitates binary data transfer between DEC computers (PDP-5, PDP-8) and various transport drives (Type 555, TU55). It covers:

• Principles of Operation: Detailed descriptions of the DECtape format, instructions, and control modes (e.g., search, read/write data, all-bits mode).
• Control Logic: Explanation of the computer interface, read/write logic, and timing/mark channels.
• Circuit Description: In-depth technical breakdown of both conventional DEC circuits (inverters, flip-flops, gates) and special circuits (Manchester reader/writer, decoders, delay circuits).
• Maintenance: Procedures for preventive maintenance, power supply checks, and troubleshooting, supported by extensive engineering diagrams.

It is intended as a reference for maintenance personnel, with full-size engineering drawings provided as separate attachments for actual repair work.