Intel LGA775 - Manual (Page 12)

INSTALLATIONS
Setting the Jumpers
Jumpers are used on 2801550 to select various settings and features
according to your needs and applications. Contact your supplier if you
have doubts about the best configuration for your needs. The following
lists the connectors on 2801550 and their respective functions.
Jumper Locations on 2801550.......................................................... 9
Configuring the CPU Frequency .................................................. 10
JP1, JP2, JP3: RS232/422/485 (COM2) Selection ....................... 10
JP4: Clear CMOS Contents .......................................................... 10
JP5: 10/100Mb LAN Enable/Disable ........................................... 10
8 2801550 User’s Manual