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To configure a hardware device. For example, IDE hard drives have a set of pins near the power cable and controller cable connectors. There is a jumper that can be set to tell the device that it is a master or slave drive on the port. Some old SCSI hard drives had a jumper for designating the number of the device on the SCSI bus. SCSI can have up to 8 devices on one bus, including the controller. So technically it only supports 7 devices. Many motherboards support processors of different speeds. These motherboards will have jumpers that can be set to tell it how fast the processor operates.

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