Dell Precision 620 Manuel d'utilisateur télécharger pdf (Page 67)

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HardwareConfigurationFeatures:DellPrecision™WorkStation620SystemsUser's

Guide

Overview

This section 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—A General Explanation

Jumpers provide a convenient and reversible way of reconfiguring the circuitry on a printed circuit board. When you reconfigure your system, you

may need to change jumper settings on your system board.

Jumpers

Jumpers are small blocks on a circuit board with two or more pins emerging from them (see Figure 1). Plastic plugs containing a wire fit down over

the pins. The wire connects the pins and creates a circuit.

Figure 1. Jumpers

To change a jumper setting, pull the plug off its pin(s) and carefully fit it down onto the pin(s) indicated.

NOTICE: Make sure that 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 system board so that you can identify each pin number based on the location of pin 1. When multiple jumpers are in a

row, all pin 1s are on the same side.

Figure 2 shows the location and default settings of the jumper blocks on your system board. See Table 1 for the designations, default settings, and

functions of your system's jumpers.

Figure 2. System Board Jumpers

Overview

I/O Ports and Connectors

Jumpers—A General Explanation

Interrupt Assignments

System Board Labels

Memory Allocations

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 130 131

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Dell Precision 620 Manuel d'utilisateur Page 67