Engineering Change Order Log

This document is an Engineering Change Order (ECO) log for the DX11-B (360 MPX/SEL Channel to Unibus). It lists specific engineering changes, problems identified, and the corresponding corrections made between 1970 and 1973. Each entry specifies the change code, the problem encountered (such as timing issues, signal glitches, or documentation errors), and the required field or in-plant corrective action, including any necessary retrofits or hardware modifications.