VT40 Graphic Display System

This document contains the engineering change order (ECO) log for the VT40 Graphic Display System from 1973. It lists three primary updates:

• VT40-00001: Adjustments to production sub-assembly handling and option drawings for improved service.
• VT40-00002: Addition of missing chassis tracks and hardware to the parts list.
• VT40-D0003: Installation of an electromagnetic shield to the A320 analog board to prevent noise interference from the UNIBUS, with instructions for both new production and retrofitting existing units.