Engineering Change Order Log

This document is an Engineering Change Order (ECO) log for the PDP-11/40 processor, covering changes implemented between August 1972 and January 1974. The log details various problems and their corresponding corrections, including:

• Documentation updates and print set corrections.
• Hardware modifications for the 861 Power Controller and power distribution cables.
• Power harness and wiring fixes to address mechanical issues, arcing, and noise interference.
• Additions of new assembly configurations and power components (e.g., H744 regulators).
• Changes to physical components like bezel types and latch moldings.

Each entry specifies the ECO code, the date, the issue, the required correction, and the in-plant/field effectivity dates.