DQS11-C DMA Controller

This document is an Engineering Change Order (ECO) log for the DQS11-C DMA controller. It outlines three specific modifications (DQS11C-B0001, DQS11C-C0002, and DQS11C-E0003) issued between March 1973 and November 1973. Each entry details the problem identified, the required technical correction, installation time, and effectivity for both in-plant production and field retrofits.