LSI-11, PDP-11/03

This document is a technical manual for LSI-11/PDP-11/03 user microprogramming. It covers the machine-micromachine structure, the LSI-11 writeable control store (WCS) module, and detailed techniques for user microprogramming. Key chapters include:

• Introduction: General features and benefits of user microprogramming.
• Machine Structure: LSI-11 machine and micromachine architecture, including the processor, system bus, and I/O devices.
• Microinstruction Set: Functional organization of the instruction set, covering vertical and horizontal microinstructions.
• WCS: Detailed hardware and software information for the Writeable Control Store.
• Programming Techniques: Procedures for entry areas, machine instruction decoding, operand passing, and interrupt handling.
• Installation: Procedures for installing the WCS module.
• Appendices: Reference materials including instruction formats and symbol tables.