IOFMAG

This document from the DECUS Program Library outlines four subroutines (DTREA, DTWRI, DTSAS, and DTSNS) designed for accessing DECtapes on TC-01 drives. Unlike standard DEC routines, these subroutines do not use interrupts. Key advantages include reduced memory footprint (106 words versus 128 words), elimination of page 0 linkage requirements for interrupts, and improved compatibility with other devices by avoiding interrupt-driven I/O. The document includes linkage details and instructions for use.