Jumpers; Cpu Frequency Ratio (J1 And J2); Cpu Voltage Setting (J3, J4); Cmos Setup (J7) - Aaeon PCM-5890 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 table below lists the function of each of the board's jumpers
and connectors.

Jumpers

Label
J1
J2
J3
J4
J5
J6
J7
J8
J9
J10
J11
J12
J13
J14
J15
J16
J17
J18
J19
J20
J21
J22
J23
J24
J25
8 PCM-5890 User's Manual
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Function
CPU frequency ratio
CPU frequency ratio
CPU voltage
CPU voltage
Ethernet LED (CRSL)
Ethernet LED (BNCL)
CMOS setup
SRAM type (cache size selection)
COM2 RS-232/422/485 selection
CPU clock setting
CPU clock setting
CPU clock setting
ECP/EPP DMA channel
ECP/EPP DMA channel
IRQ selection
IRQ selection
Parallel port IRQ selection
Buzzle enable
COM2 RS-232/485 selection
COM2 RS-232/485 selection
COM2 RS-232/485 selection
COM2 RS-232/485 selection
System reset
Watchdog timer invoke
Watchdog enable/disable