Automatic Magnetic Tape Control

The Type 57A Automatic Magnetic Tape Control connects a PDP-4 computer to up to eight magnetic tape transports. It supports various tape densities (200, 556, and 800 characters per inch) and works with transports such as Digital's Type 50 or 570, and IBM Types 729 II, IV, V, VI, or 7330.

Key features include: - Support for two control modes: Normal and Continuous. - Data transfer execution via PDP-4 Data Interrupt and Program Interrupt mechanisms. - Capability to handle block transfers, scatter reads, and gather writes. - Extensive instruction set for controlling tape motion, read/write functions, and status monitoring. - Logical configuration involving interface units (Types 520, 521, 522) depending on the transport model.

This guide includes a detailed function list, flowcharts for programming, and descriptions of error conditions like parity errors and read-compare errors.