Basic PDP-11/30 Description and Instruction Set Errata

This document contains a series of corrections (errata) for the original engineering specification ES:0001 for the basic PDP-11/30 system, dated March 28, 1968. The updates include specific text replacements, clarifications on address boundaries, modifications to condition code behavior for various instructions (MOV, BRANCH), structural changes to the instruction set (such as the addition of the OPERATE group and removal/re-coding of certain instructions), and technical notes on register usage and addressing. An appendix provides corrected coding tables for Rotate/Shift operations and updates for various instruction appendices.