Hardware Configuration Features

Appendix B

This appendix provides specific information about the jumpers on the system board, the connectors and sockets on the system board, and the input/output (I/O) ports and connectors on the back panel of the computer. It also pro- vides some basic information on jumpers.

Jumpers—A General Explanation

Jumpers provide a convenient and reversible way of reconfiguring the circuitry on a printed circuit board. When reconfiguring the system, you may need to change jumper settings on the system board; you may also need to change jumper settings on expansion cards or on drives.

Jumpers

A jumper is a small block on the system board with two or more pins emerging from it.

A plastic plug containing a wire fits 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 the system board. See Table B-1 for the designations, default settings, and functions of the system board’s jumpers.

Hardware Configuration Features B-121

2100/180, 2100/200 specifications

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