Aaeon SBC-590 User Manual page 39

CN20, the card's keyboard connector, is a 6-pin mini-DIN
connector on the card mounting bracket. The SBC-590 also
comes with an adapter to convert to a standard DIN connector and
to a PS/2 mouse connector
CN20
The SBC-590 provides a second connector designed for external
keyboard input (CN17). To locate CN20 and CN17 please see the
board layout in chapter 2.
32 SBC-590 User's Manual