System Status Registers, KT11-C Engineering Change Order Log

This document serves as an engineering change order (ECO) log for the M8108 system status registers, specifically used with the KT11-C memory management unit in PDP-11/45 and PDP-11/50 processors. It tracks a series of technical issues and their respective hardware or documentation corrections, including:

• M8108-00001: Various hardware fixes, including resistor adjustments, signal synchronization, and logic changes.
• M8108-00002 & 00003: Addressing MTPI instruction behavior and console physical access address errors.
• M8108-B0004 & B004A: Corrections for etched board revisions and specific wiring retrofits (jumpers).
• M8108-B0007: Fixes for illegal address abort failures, requiring specific revision levels for the KB11-A processor component.