Etos V5b

This document provides a revision history and detailed technical information regarding error messages for the ETOS V5B operating system. Specifically:

• Revision History: The first page lists updates to the manual, including specific page replacements and the nature of the changes (such as usage corrections, new configuration sections, and patch corrections).
• Error Messages: The remaining pages detail various system error messages. It covers general "SCALE" command errors (e.g., bad numbers, invalid file specifications, unknown commands) and specific runtime errors that halt the virtual machine.
• Troubleshooting: The text explains how to interpret these errors, particularly those related to illegal input/output instructions, field jumps, and halt instructions. It provides recovery procedures for specific errors and identifies critical system malfunctions related to hardware, disk packs, or file structure corruption.