Microprocessor Commands and Messages

This document, titled 'Microprocessor Commands and Messages' (March 1979), serves as a technical manual for operating the console of the DECSYSTEM-2020. It covers:

• Console Operations: Explains the distinction between console mode and user mode, detailing how to switch between them and the rules for command formatting.
• Command Glossary: An extensive list of commands organized by function, including Boot, Enable/Disable, Examine, Mark/Unmark Microcode, Miscellaneous, Read CRAM, Select Device, Set and Deposit, Clock control, Microcode control, and Program control commands.
• Error Messages: A comprehensive troubleshooting section defining various error codes encountered when the system is not in user mode.
• KLINIK: Details on the remote diagnosis link, including its four operational states and how to control access to it.
• Status Indicators: Information on console status registers and KS10 halt status codes used for system diagnostics.