Etos System

Summary

The ETOS (Extended Timeshared Operating System) System User's Guide provides comprehensive instructions for users operating within the ETOS environment on DEC PDP-8 series computers.

Key aspects of the document include:

• System Overview: Explains the time-sharing architecture, which provides each terminal with a "virtual" PDP-8, and introduces the SCALE (System Command and Login/Logout Executive) command interface.
• Operating ETOS: Details the procedures for logging into the system, managing account numbers, and interacting with virtual machines.
• Commands: Provides a complete reference for SCALE commands, including virtual register manipulation, memory management, and system status monitoring.
• OS/8 and COS Integration: Outlines the specific differences and operational adjustments required when running OS/8 and COS under ETOS, including modified system programs and specific device handling.
• Technical Appendices: Includes reference lists for commands, error messages, and character codes to support both general users and those performing assembly-level programming under ETOS.