@cm @ijk64 @Gammitin I think that was for the keyboard. I had a SparcClassic which I think is similar and it used a db25 serial connector
Here’s a good ref doc too : https://docs.oracle.com/cd/E19127-01/sparc.classic/801-2176-13/801-2176-13.pdf#page175
@ijk64 @Gammitin IIRC, those had mini-DIN serial ports, have fun finding a cable...