Hardware configuration features, Hardware configuration, Features – Dell Precision 610 User Manual
Page 88: Jumpers and switches-a general explanation, Overview
Hardware Configuration Features: Dell™ Precision™ WorkStation
610 Mini Tower Systems
Jumpers and Switches - A General Explanation
Overview
This appendix provides specific information about the jumpers on your system board and the input/output (I/O) ports and
connectors on the back panel of your computer. It also provides some basic information on jumpers and switches, a listing of
interrupt request (IRQ) assignments, and memory maps.
Jumpers and Switches-A General Explanation
Jumpers and switches provide a convenient and reversible way of reconfiguring the circuitry on a printed circuit board. When
reconfiguring your system, you may need to change jumper settings on your system board; you may also need to change jumper
and/or switch settings on expansion cards or drives.
Jumpers
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 jumper setting, pull the plug off its pin(s) and carefully fit it down onto the pin(s) indicated.
CAUTION:
Make sure your system is turned off before you change a jumper setting. Otherwise, damage to your
system or unpredictable results may occur.
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 system board. See Table B-1 for the designations,
default settings, and functions of your system's jumpers.
Switches
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).