Jumpers And Connectors; System Temperature Thermal Sensor (J1); Cpu Frequency Ratio (J3); Clear Cmos (J4) - Aaeon PCM-7890 User Manual

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.

Label
J1
J2
J3
J4
J5
J6
J7
J8
J9
J10
J11
J12
J13
J14
J15
10 PCM-7890 User Manual
Function
System temperature thermal sensor
Reserve for future use (default : 1-2 close)
CPU frequency ratio
Clear CMOS
COM3 RI pin voltage select
COM4 RI pin voltage select
DOC address select
ATX soft-power switch connector
Reserve for future use
COM2 RS-232/422/485 select
LCD driving voltage select
LCD clock select
Reserve for future use (default : 1-2 close)
COM2 RS-232/422/485 select
Audio output select