I/O Operations

This document provides a functional specification for the I/O structure of the RSX-11D operating system. It defines how logical I/O units are mapped to physical device-unit references, explains the queuing mechanism for I/O requests, and details the role of "privileged" I/O handler tasks. It includes comprehensive information on I/O directives, function codes, status blocks, and the protocols for handler task initialization, interrupt service routines, and system traps for power-failure recovery and system rundowns.