Bluefish Functional Specification

This document provides a preliminary software reference for the Bluefish (PDP-11/68) processor, a high-end addition to the PDP-11 architecture designed for high-performance and cost-effective multiprocessor configurations.

Key areas covered include: * Processor Overview: Introduction to the architecture, performance targets, and system configuration using the PPBI backplane. * Instruction Set: Detailed tables for base instructions (single and double operand), program control instructions, and miscellaneous processor controls. * Memory Management: Descriptions of the Memory Management Unit, virtual address mapping, and the various control registers used for fault recovery and status monitoring. * Floating Point Processor: Architecture and instruction set for the optional FP11 floating-point unit. * Console Specification: Details on console functions, command syntax (e.g., BOOT, CONTINUE, DEPOSIT, EXAMINE), and communication with the operating system. * Programming Differences: Extensive tables comparing the 11/68 against other PDP-11 family members, highlighting traps, register behaviors, and specific instruction implementations.