Magtape Routines for PDP-10

This document contains the source code and assembly instructions for the MTASRX magtape routines, specifically designed for the PDP-10 (TM-10) system. It includes dispatch tables, subroutines for tape initialization, reading, writing, and error handling, along with version details (V420) from May/June 1969. The code is documented for use in assembly with system parameter file S.MAC.