Jumpers and DIP Switches

Jumper is a metal bridge to close an electrical circuit. Jumper consists of a plastic plug that fits over a pair of protruding pins and are used to configure motherboards. By placing a jumper plug over a different set of pins, you can change a motherboard’s parameters.

DIP (Dual In-line Package switch) are a set of tiny toggle switches built into a dual in-line package (DIP), which is mounted directly on a circuit board. The tip of a pen or pencil is used to flip the switch on (close the circuit) or off (open the circuit).

These are used to configure various hardware options on the motherboard. For example, some processors use different voltages (1.5, 3.3, or 5 volts) which is set on motherboard either by a jumper or a DIP switch. Motherboards often have either several jumpers or one bank of DIP switches. Individual jumpers are often labeled with the moniker JPx (where x is the number of the jumper). Many of the motherboard settings that were set using jumpers and DIP switches are now either automatically detected or set manually in the CMOS setup program.

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