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A jumper is referred to as
open
or
unjumpered
when the plug is pushed down over
only one pin or if there is no plug at all. When the plug is pushed down over two pins,
the jumper is referred to as
jumpered
. The jumper setting is often shown in text as
two numbers, such as
1-2
. The number
1
is printed on the circuit board so that you
can identify each pin number based on the location of pin 1.
Figure B-1 shows the location and default settings of the jumper blocks on your sys-
tem board. See Table B-1 for the designations, default settings, and functions of your
system’s jumpers.
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Switches control various circuits or functions in your computer system. The switches
you are most likely to encounter are dual in-line package (DIP) switches, which are
normally packaged in groups of two or more switches in a plastic case. Two common
types of DIP switches are
slide
switches and
rocker
switches (see the following
illustration).
Each of these switches has two positions, or
settings
(usually
on
and
off
). To change
the setting of a slide switch, use a small, pointed object such as a small screwdriver or
a straightened paper clip to slide the switch to the proper position. To change the
setting of a rocker switch, use the screwdriver or paper clip to press down on the
appropriate side of the switch. In either case, do not use a pen, pencil, or other object
that might leave a residue on the switch.
slide switches rocker switches
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