Floppy Disk Controller

This document is an Engineering Change Order (ECO number M7726-00004) detailing necessary modifications to the M7726 Floppy Disk Controller. The document addresses two primary issues: - The erase gate delay was insufficient for all track locations, impacting drive interchangeability. - The head load settling time was sensitive to mechanical adjustments, potentially causing CRC errors.

The correction involves replacing four integrated circuit (IC) ROM chips with updated versions. It specifies immediate rework for modules in manufacturing and a phased transition for production units.