IBM ThinkPad T20 - Rear View

Rear view
1 Security keyhole
2 TV-out connector
3 Serial connector
4 Parallel connector
5 External-monitor connector
6 Modem connector
7 Ethernet connector
8 Power jack
9 Universal serial bus (USB) connector
Note: T23 series have two USB connectors.
10 External-input-device connector
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Locations
ThinkPad T20, T21, T22 and T23 series 141