Here is DRVTEST, a little application for testing, diagnosing and investigating floppy disk drives and EXDOS interfaces.

I wrote it to help with EXDOS 3, and also to help keep vintage hardware running.

DRVTEST.COM can be loaded from BASIC or run as an IS-DOS command, or DRVTEST.ROM can be put in a ROM and started with :DRVT.

It is quite technical in places, but you can press H for help. Or just select a drive with A or B and then press T for Tests to exercise your drive!