Full Duplex Pseudo Teletype Service Routines

This document contains the source code for the PTYSRF module, which implements full-duplex pseudo-teletype service routines for a system. It includes definitions for system parameter files, accumulator assignments, and various device-dependent status bits and routines such as PTYOUT, PTYIN, and PTYSET for handling PTY device input/output synchronization, monitoring, and status management. The document also includes a detailed symbol table listing internal and external references for the sub-program.