New Format Dectape Service

This document is a source code and technical reference for the DECTape service routine (DTASRN) designed for the PDP-10 computer system. It includes definitions for system parameters, tape handling flags, directory management procedures, and DUMP-mode input/output handling. The document also provides extensive symbol tables, cross-references for routine calls, and operational details for managing file structures and data transfers on the DECTape controller.