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8 SBC-350A User's Manual
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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.
You may find pair of needle-nose pliers useful for setting the jumpers.
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.
CPU clock and AT clock select (J2, J3, J4, J5)
J2, J3, J4, and J5 are used to adjust the CPU clock and AT clock. Set
the CPU clock according to the base CPU speed. The default setting is
33 MHz.
CPU clock and AT clock select (J2, J3, J4, J5)
J2 J3 J4 J5
40 MHz
33 MHz
25 MHz
20 MHz
Display type (J6)
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 J6 to color.
Monochrome Closed
Color Open (default)