Use
When a jumper is placed over two or more jumper pins, an electrical connection is made between them, and the equipment is thus instructed to activate certain settings accordingly. For example, with older PC systems, CPU speed and voltage settings were often made by setting jumpers. Informally, technicians often call setting jumpers "strapping". To adjust the SCSI ID jumpers on a hard drive, for example, is to "strap it up".
In order to set a jumper "on", the user has to place the jumper over the desired pins. To turn it "off", it can simply be removed from the circuit without having to use any kind of tool.
Jumper blocks and jumpers are also often used on motherboards to clear the CMOS information, resetting the BIOS configuration settings. This allows the computer to boot if a recent BIOS setting made it unable to boot, or if the CMOS boot password was forgotten.
Read more about this topic: Jumper (computing)
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