TOPS-20 Monitor Calls

This document, dated September 1985, serves as a comprehensive guide for assembly language programmers using the TOPS-20 operating system (V6.1). It introduces the monitor calls required for system services, such as input/output (terminal and files), process control, file management, software interrupts, and inter-process communication. The guide is organized by function, beginning with basic concepts and proceeding to advanced topics like extended addressing and multi-process job structures. It also provides practical coding examples and details regarding MACRO-10 and MACSYM support routines.