Chapter 1 Hardware Configuration 9
How to set jumpers
You configure your card to match the needs of your application by
setting jumpers. A jumper is the simplest kind of electric switch. It
consists of two metal pins and a small metal clip (often protected by a
plastic cover) that slides over the pins to connect them. To “close” a
jumper you connect the pins with the clip. To “open” a jumper you
remove the clip. Sometimes a jumper will have three pins, labeled 1, 2
and 3. In this case you would connect either pins 1 and 2 or 2 and 3.
If you have any doubts about the best hardware configuration for your
application, contact your local distributor or sales representative
before you make any changes.
Display type (JP15)
This jumper sets the display adapter type attached to your card. If you
are using a monochrome LCD or EL screen which uses a CGA, EGA,
VGA or other color display adapter, set JP15 to color.
JP15
Setting
Open
Monochrome
Closed (default)
Color
Watchdog timer system reset/IRQ15 (JP8)
When the watchdog timer activates (CPU processing has come to a
halt), it can reset the system or generate an interrupt on IRQ15. Set
jumper JP8 as shown in the following table:
JP8
Setting
1-2
System Reset
3-4
IRQ15
Bus clock selection (JP4)
JP4
Selection
1-2
Bus clk = CPU clk * 2/8
2-3
Bus clk = CPU clk * 2/6
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