VT40

This document is an Engineering Change Order Log from Digital Equipment Corporation, published in 1973, specifically for the VT40 Graphic Display System (used with the PDP-11/05 processor). It details three key engineering changes:

1. VT40-00001 (Jan-73): Addressed production setup issues for sub-assemblies by modifying relevant option drawings to improve service.
2. VT40-00002 (Jul-73): Corrected documentation errors by adding previously unlisted chassis tracks and hardware to the Parts List.
3. VT40-D0003 (Aug-73): Resolved a problem with electromagnetic noise superimposed on the A320 analog board, caused by UNIBUS cable routing. The correction involved adding an electromagnetic shield. This change included instructions for a phased production implementation by December 1973 and a mandatory field retrofit for all existing GT40 systems, providing details on installation time and required parts.