Assembler Programming Under ETOS

This document covers assembler programming requirements and capabilities under the ETOS operating system. It provides detailed descriptions of various Input/Output Transfers (IOTs) for terminals, card readers, line printers, and system functions (SYSCAL). Additionally, it explains extended memory handling, time-sharing IOTs, and ETOS channel I/O commands, including how they map to SCALE terminal commands. The guide includes numerous code examples for implementing these features.