Jumpers, also called jumpers, are used to store information of several bits when it is inconvenient to use ROM for this. The specified information is stored until it is changed, and its modification is performed mechanically.
Instructions
Step 1
Regardless of which device you are going to change the jumpers in, be sure to de-energize it. Even if you do not spoil anything by rearranging them in the turned on device, the change will not take effect until the restart, since the state of the jumpers is read at the moment the device is turned on.
Step 2
Use tweezers or small pliers as a tool to reposition the jumpers. In case, after removal, one of the jumpers becomes unnecessary, put it in a container with a lid in case it is needed elsewhere. If, on the contrary, more jumpers are required than were originally required, remove the additional jumper from some faulty device: motherboard, hard drive, optical drive, etc.
Step 3
If you need to select the hard disk operating mode (Master, Slave, Cable select), take a look at the sticker with the table on the drive case. It contains options for the location of jumpers for all three cases. On an optical drive, the mode is easier to select: just rearrange just one jumper, and its positions corresponding to one of the three modes are indicated directly on the body. For two devices located on the same loop, the following mode combinations are possible: - the first device is Master, the second is Slave; - the first device is Slave, the second is Master; - both devices - Cable select. All other options will lead to inoperability of both devices …
Step 4
Disk drives for floppy disks of the latest models do not have jumpers at all. If you find a drive of an older design, set a single jumper on it in the position corresponding to the device "B:". If you have two drives on the same ribbon, configure both devices in the same way. Which of them will become the "A:" drive, and which - the "B:" drive, depends on their relative position (before or after twisting on the loop). Straight drive cables without twists can be found only in computers that are not compatible with the IBM PC; in them, one drive should be configured with jumpers as "A:" and the other as "B:".
Step 5
On a modern motherboard, you can find only one jumper - erase CMOS. If you need to carry out this operation, remove the jumper from the contacts corresponding to normal operation, move to another pair of contacts intended for erasing, hold there for about twenty seconds, and then move into place. The location of both pairs of contacts is indicated in the instructions for the board. If there is no corresponding jumper, do not under any circumstances erase CMOS by shorting the battery. Remove the battery, close the contacts on the board intended for its connection, remove the jumper from these contacts, and only then install the battery in place.
