B-2
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A jumper is referred to as
open
or
unjumpered
when the plug is pushed down over
only o ne pin o r if the r e i s no pl ug at al l. When the plug is p us hed do w n ov er tw o 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
normall y pa ckag ed in group s of two or more sw itches in a pla s tic cas e. Two c omm on
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 sli de switc h , use a s mall, poi nted objec t suc h as a sm all scre wd river 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
appropri ate sid e of the s witch. In either c ase, do no t use a p en, penc il, or oth er object
that might leave a residue on the switch.
slide switches rocker switch es
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