Hardware Configurat i on Features B-1

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This appendix provides specific information about the jumpers on your system board
and the in put/out put (I/O ) ports an d conn ectors on th e back panel of y our co mputer. It
also provides some basic information on jumpers and switches, a listing of interrupt
request (IRQ) assignments, and memory maps.

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Jumpers and switches provide a convenient and reversible way of reconfiguring the
circuit ry on a prin ted circuit b oard. Whe n reconfi guring your sy s tem, y ou m a y need to
change jumper settings on your system board; you may also need to change jumper
and/or switch settings on expa nsion cards or drives.
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Jumpers are small blocks on a circuit board with two or more pins emerging from
them. Plastic plugs containing a wire fit down over the pins. The wire connects the
pins and creates a circuit.
To change a jum per setting, pull the plug off its pin(s) and c areful ly fit i t do wn on to the
pin(s) indicated.