550 Micro-Magnetic Tape Control

This document provides a comprehensive overview of the Type 550 Micro-Magnetic Tape Control, designed to interface up to four Type 555 dual tape transports with PDP-4 or PDP-1 computers. It covers technical specifications such as word assembly/disassembly, tape formatting using a Mark Track, and timing constraints. The document includes a detailed instruction list for PDP-4 programmers, a transfer operation chart explaining flag meanings, and specific procedural guides for system testing, dumping, and retrieving data. Additionally, it contains a collection of field service technical tips and internal memoranda addressing common hardware issues, such as motor grounding, timing restrictions, and troubleshooting instructions for installations at customer sites like Keydata Corp.