The Sun 3/80 is unique in having a floppy disk interface.
The board has the usual connector for a 34 pin ribbon cable.
(As seen above on the right.)
The board has an Intel N82072 floppy controller chip nearby.
It seems very unlikely that I will have anything to do with this interface, unless there is some way to control individual pins in GPIO fashion. But I coubt that this is possible.
Tom's Computer Info / tom@mmto.org