Index, Photoamp and Sector Counter for RK05

This document lists eight engineering change orders (ECOs) for the M7700 module, which is used for index, photoamp, and sector counter functionality in the RK05 disk drive system. The changes address various issues, including:

• Reducing noise sensitivity in the sector sensor amplifier.
• Correcting circuit schematic errors and missing information.
• Fixing indicators that light before the drive is ready.
• Improving marginal operation of the index separator.
• Addressing false triggering of one-shots.
• Ensuring cartridge interchangeability between RK05 and RK03.
• Adding compatibility for RK11-D drive selection.
• Resolving power-up race conditions that caused false write-protect signals.