Very Computer

Hi !
I think it would be nice to see the actually written or read track of
my floppy drives.
Since a commercial trackdisplay may not fit into the small hole in my tower
case (Yes, A500 tower !) , I thought it would be possible to build one
myself. Anybody got information about the signals that transfer the
track and/or sector signals to the drive and how I can use them ?

Or, even better : is there a circuit-layout with description for this purpose ?

Thanks, Ralf