PDP-11 Instruction Set Errata Sheet

This interoffice memorandum, dated February 11, 1969, provides a series of corrections (errata) for the PDP-11 Instruction Set documentation. It details specific text changes for several sections, including:

• Storage Organization: Corrections regarding terminology for bytes vs. words and interrupt status ranges on Page 1.
• Instructions: Technical corrections to the definitions of Add Byte (ADB), Add Word (ADW), Compare Byte (CPB), and Compare Word (CPW) on pages 6, 7, and 10.
• Clarifications: It introduces a footnote defining "with sign extended" as the propagation of the sign bit (Bit 7) into bits 8-15 to form a 16-bit quantity.