This board helps test floppy drives of several different types:

• Standard IBM 34-pin drives (3.5" and 5.25")
• IBM PS/2 40-pin drives with embedded power connections
• Shugart 8" floppy drives
• Apple II (original Disk II)
• HP 34-pin drives (as found in many 9122 enclosures)
• HP 26-pin drives (found in older enclosures and machines)
• IBM 31SD and 51TD floppy drives

The board basically breaks out every signal to a control switch, indicator LED, or test point. It's not designed as a flux imaging tool--it's just a simple way to exercise features of a floppy drive.

There is an optional section of the board that is a step controller for the head stepper motor. This controller has an encoder wheel and a small 7-segment display. It will let you select and automatically step to a particular track.

Uses an ATmega328PB microcontroller as its CPU.