4 PC card slot
5 PC Card eject button
6 IrDA port
7 Security keyhole
8 Power jack
9 External-monitor connector
10 Universal serial bus (USB) connector
11 Line-in jack
12 LAN connector
13 Modem connector
1
2
3
4
5
6
7
8
9
10
11
12
13
102
ThinkPad X20, X21, X22, X23, X24