IBM 704 - Manual (Page 308)

Changing Jumper and Switch Settings
Changing a Jumper Setting
A jumper covers pins on a pin block and might be positioned to the
left or to the right. The jumper setting depends on which pins are
covered.
To change a jumper setting:
1. Lift the jumper straight up off the pin block.
2. Slide the jumper down over the correct pins.
Note:
1. Always grip the narrow ends of the jumper when you
use a pair of fine needle-nosed pliers to remove or install
a jumper. Gripping the wide sides of the jumper can
damage contacts inside of the jumper, causing
intermittent problems.
Do not squeeze the pliers or other tool that you use to
remove a jumper, or you might bend or break the stake
pins on the board.
2. Jumper positions for system-board configuration jumpers
are described and illustrated in “Setting System-Board
Configuration Jumpers” on page 292.
Setting SCSI ID Jumpers
If you install additional SCSI devices in the upper-left front bay, set
their SCSI IDs so that they do not conflict with IDs used in the
hot-swap bays.
Jumpers on the front of the SCSI backplanes define the SCSI IDs for
hot-swap drives. See Table 14 on page 292 for the default SCSI IDs.
290 PC Server 704 User's Handbook