Rear view for X20, X21
1 Headphone jack
2 Mic jack
3 Compact flash slot
4 PC card slot
5 PC Card eject button
6 Security keyhole
7 Power jack
8 Universal serial bus (USB) connector
9 External-monitor connector
10 Line-in jack
11 LAN connector
12 Modem connector
1
2
3
4
5
6
7
8
9
10
11
12
Rear view for X22, X23, X24
1 Headphone jack
2 Mic jack
3 Compact flash slot
Chapter 3. ThinkPad X20, X21, X22, X23, X24
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