KE11-E and KE11-F Instruction Set Options Manual

This document is a technical manual for the Digital Equipment Corporation (DEC) PDP-11/40 computer system, detailing the KE11-E Extended Instruction Set (EIS) and KE11-F Floating Instruction Set (FIS) Options.

The KE11-E (EIS) is a hardware option that enhances the PDP-11/40's capabilities by adding fixed-point arithmetic instructions, specifically Multiply (MUL), Divide (DIV), Arithmetic Shift (ASH), and Arithmetic Shift Combined (ASHC) for signed 16-bit or 32-bit numbers.

The KE11-F (FIS) is a separate hardware option that requires the KE11-E to be installed. It further expands the instruction set to include single-precision floating-point arithmetic operations, such as Floating Add (FADD), Floating Subtract (FSUB), Floating Multiply (FMUL), and Floating Divide (FDIV), aiming to significantly improve computational speed.

The manual provides a comprehensive overview, covering:

• General Description: Purpose, configuration, and specifications for both options.
• Programming: Details on instruction formats, operations, and examples for software development.
• Theory of Operation: Explanations of the underlying mathematical principles, including binary 2's complement, multiplication, division, and floating-point arithmetic algorithms.
• Logic Description: In-depth hardware details, functional block diagrams, and interface information with the main KD11-A Central Processor.
• Installation and Maintenance: Procedures for installing the options, diagnostic programs, and troubleshooting guidelines.

The document serves as a guide for understanding, programming, and maintaining these instruction set extensions for the PDP-11/40 system.