S u b C o m p a c t B o a r d G E N E - 9 6 5 5Chapter 2 Quick Installation Guide 2-173 RXC4 RTSC5 TXC6 CTSC7 DTRC8 RIC9 GND2.22 PS/2 Keyboard/Mouse Connector (CN19)Pin Signal Pin Signal1 KBDAT 2 KBCLK3 KB_GND 4 +5V_DUAL5 MSDAT 6 MSCLK2.23 COM4 RS-232 Serial Port Connector (CN20)Pin Signal1 DCDD2 DSRD3 RXD4 RTSD5 TXD6 CTSD7 DTRD8 RID9 GND