TC02 DECtape Transport Control Instruction Manual

This document serves as an instruction and maintenance manual for the TC02 DECtape Control, a unit manufactured by Digital Equipment Corporation. The TC02 synchronizes and controls the transfer of information between the PDP-9 Programmed Data Processor and up to eight TU55 DECtape Transports. It acts as a magnetic tape storage system, uniquely storing data in fixed-position blocks on magnetic tape, which allows for non-destructive data replacement. The control unit utilizes dedicated timing and mark channels on the tape to precisely govern read/write operations and data formatting, making performance independent of tape speed variations. It handles 18-bit computer words, assembling them from or disassembling them into six 3-bit tape words, and employs parity checking for data integrity. The manual details various operational modes (Normal and Continuous) and functions, including tape movement, block searching, reading/writing data, and formatting timing/mark tracks. It also describes status registers, instruction sets, error conditions (timing, parity, selection, end-of-tape, mark-track), and provides comprehensive installation and maintenance procedures, including physical characteristics, power requirements, and module-level circuit descriptions.