Intel 430TX - Manual (Page 64)

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J3 Key Board Connector
J4 PS/2 Mouse Connector
J5 COM2 Port
J6 COM1 Port
J7 Parallel Port
J8 Floppy Drive Port
J9 SCSI Port
J10 Wide SCSI Port
J11 IR Connector
USB1 USB Connector
IDE1-2 IDE Drive connector
4.8 Pin Definition for Cable Connection
There are two cables for COM1 and COM2. Each cable is
connected to 10-pin IDC connector. The pin definitions for
COM1/COM2 are as follows:
9-pin D-Sub
Definition 10-pin IDC
Pin-1 CD, Carrier Detect Pin-1 (IN)
Pin-2 RXD, Receive Data pin-3 (IN)
Pin-3 TXD, Transmit Data Pin-5 (OUT)
Pin-4 DTR, Data Terminal Ready Pin-7 (OUT)
Pin-5 GND, Signal Ground Pin-9
Pin-6 DSR, Data Set Ready Pin-2 (IN)
Pin-7 RTS, Request To Send Pin-4 (OUT)
Pin-8 CTS, Clear To Send Pin-6 (IN)
Pin-9 RI, Ring Indicator Pin-8 (IN)
25-pin D-Sub Definition 10-pin IDC
Pin-8 CD, Carrier Detect Pin-1 (IN)
Pin-6 DSR, Data Set Ready Pin-2(IN)
Pin-3 RXD, Receive Data Pin-3 (IN)