PDP-11/05 Processor

This document is an Engineering Change Order Log for the PDP-11/05 Processor, detailing modifications and corrections implemented between December 1972 and November 1973. The changes address a range of issues, primarily categorized as:

1. Documentation Accuracy: Numerous updates were made to parts lists, wire lists, drawing directories, and the incorporation of new prints or illustrated parts breakdowns to ensure correct manufacturing and product specifications.
2. Physical Design and Assembly Improvements: Adjustments included correcting chassis holes, rerouting transformer cables, changing screw types, updating card guides (including a cost-reduction change), modifying fan mounting, and replacing connector retainers, all aimed at resolving assembly and fit issues.
3. Reliability and Performance Enhancements: Key changes focused on improving system robustness, such as adding filter capacitors to prevent random power failures from electrical transients and implementing multiple cooling modifications (e.g., reworked filler strips, foam seals, and air baffles) to address heat-related reliability problems, particularly in warmer operating environments.
4. Logistical Coordination: The log also includes notes on the implementation of changes, such as revised break-in dates due to parts availability and coordination between different change orders.

Overall, the document reflects an ongoing process of refining the PDP-11/05 Processor's design, manufacturing processes, and operational reliability during its early production phase.