Rainbow Hard Disk Controller

This document contains a series of electronic schematic diagrams for the Rainbow Hard Disk Controller. The sheets detail various aspects of the controller's design, including:

• Bus connectors and expansion ports (Sheet 1)
• Hard Disk Controller (HDC) logic and WD1010-00 interface (Sheet 2)
• Port address decoding and data buffer RAM (Sheet 3)
• Status ports and Index/Step logic (Sheet 4)
• Write precompensation and drive buffers (Sheet 5)
• Read clock, pulse processing, and clock synchronization circuitry (Sheet 6 & 7)
• Control voltage and VCO circuitry (Sheet 8)
• Cable pinouts for the controller and drive (Sheet 9)