10 SBC-554V/555 User's ManualJumpers and connectorsConnectors on the board link it to external devices such as harddisk drives, keyboard, or floppy drives. In addition, the board has anumber of jumpers that allow you to configure your system to suityour applications.The table below lists the function of each of the board jumpers andconnectors:Jumpers and connectorsLabel FunctionJP1 CPU clock RatioJP2 DRAM Voltage settingJP3 VIO Voltage settingJP4 Vcore Voltage settingJP5 PCI clock settingJP6 CPU external clock selectionJP7 LCD Panel's Voltage settingJP8 Clear CMOS DataJP9 SSD address settingJP10 RS232/422/485 selectionJP11 Hardware ResetCN1 HDD connectorCN2 FDD connectorCN3 LCD connectorCN4 USB connectorCN5 Parallel connectorCN6 COM2 connectorCN7 COM1 connector (D-SUB 9-pin)CN8 VGA connector (D-SUB 15-pin)CN9 Keyboard/Mouse connector (MINI DIN 6-pin)CN10 Power connector (4-pin)CN11 Inverter connector (5-pin)CN12 Reserved IR connectorCN13 HDD LED connector