IBM ThinkPad 340 Series Hardware Maintenance Manual page 122

System Board (720, 720C)
▌1▐ External Input Device Connector
▌2▐ System-Expansion Connector (240-pin)
▌3▐ Parallel Connector
▌4▐ Serial Connector
▌5▐ Password-override Connector
▌6▐ PCMCIA Connector
▌7▐ Base Memory Card Interface
▌8▐ Video Card Interface
▌9▐ Backup Battery Connector
▌10▐ Hard Disk Drive Connector
▌11▐ Processor Card Interface
▌12▐ Keyboard Control Card Interface
▌13▐ Speaker Connector
▌14▐ Voltage Converter Interface
▌15▐ Diskette Drive Interface
▌16▐ System Status Indicator Connector
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