The Computers of the Sun3 series usually used the type 3 keyboard.
Only the Sun3/80 was sold with the newer type 4 keyboard.
Modern Sparc machines have this type 5 keyboard which looks suspiciously like a PC keyboard.
With this small adapter you can plug a type 4 as well as a type 5 keyboard to the DB-15 keyboard connector of a Sun3.
It is very funny to turn the mousepad 90 degrees and watch the next luser...
With the Type-5 keyboard Sun introduced one-eyed mice and ball mice.