Magnetic Tape Control 516 Instruction Manual Volume 1

This manual, Volume 1, serves as a comprehensive guide for the installation, operation, and maintenance of the Digital Equipment Corporation (DEC) Magnetic Tape Control 516 and its associated interface units (Types 520, 521, and 522A). It details the system's application, specifications, and programmed operations, including CONI/CONO instructions and various command repertoires like Rewind, Write, Read, and Space Forward/Backward.

The document thoroughly explains the underlying logic of the tape control system, covering command processing, tape status management (e.g., tape status quint-flop), write logic (including character timing, data outputs, and different write commands like blank tape and file writes), and read logic (encompassing input levels, parity checks, character sensing, and read comparison functions). Each interface (520, 521, 522A) is described in detail regarding its specific selection and command inputs, write and read logic, data handling, and status signals from the tape transports.

Furthermore, the manual provides essential information for maintenance, including equipment layout, preventive maintenance procedures, adjustment and calibration (e.g., crystal clocks and various delays), and programming suggestions. It also covers installation and preoperational check-out steps such as site selection, unpacking, cable connections, power controls, and preoperational testing. Volume I focuses on the functional descriptions, while Volume II contains complete signal glossaries and engineering drawings.