DH11 Register and Byte Control

This document is an Engineering Change Order log for the M7278 DH11 Register and Byte Control module. It details three specific modifications (M7278-00001, M7278-D0002, and M7278-D0003) issued in 1973. The changes address issues such as missing signal references on prints, incorrect capacitor documentation, and physical etch line errors causing ground shorts and parity operation issues on the boards.