Instruction manual

10 PCM-4896 User Manual
Jumpers and connectors
Connectors on the board link it to external devices such as hard
disk drives, a keyboard, or floppy drives. In addition, the board
has a number of jumpers that allow you to configure your system
to suit your application.
The following tables list the function of each of the board's
jumpers and connectors.
Jumpers
Label Function
J1 Internal buzzer select
J4 Clear CMOS
J5 ATX soft-power switch connector
J6 Audio output select
J8 LCD driving voltage select
J9 LCD clock select
J10 Reserve for future use (default: 2-3 close)
J11 COM4 RI pin voltage select
J12 COM3 RI pin voltage select
J13 COM2 select
J14 COM2 selection
SW1 (1~3) CPU frequency ratio
SW1 (5, 6) DOC address select
SW2 (1) CPU clock select