PDP-11 Instruction and Architecture Compromises

This document is an interoffice memorandum from R. Cady dated February 24, 1969, regarding the PDP-11 architecture. It serves as a response to various comments, objections, and suggestions raised during the design review process. The memo addresses major areas of concern, notably the perceived lack of simplicity, uniformity, and symmetry in the instruction set.

Key actions outlined include: - Proposed changes to nomenclature and specific addressing modes. - Deletion or modification of several instructions (e.g., ANB, NOP, JSR, and various Push/Pop group commands). - Responses to specific comments from engineering committees and reviewers like Gordon Bell. - An appendix containing a detailed list of numbered comments and feedback received from various parties, including Bruce Delagi, Teradyne, and the Engineering Committee.