IBM Netfinity 4500R, User Reference Manual

Page: 75 / 198

Chapter 6. Installing Options
63
System board
System board switches and jumpers
The following illustration identifies the switches and jumpers on the system board.
Note: The illustrations in this document might differ slightly from your hardware.
Note: Any jumper blocks on the system board that are not shown in the illustration
are reserved. For normal operation of the system, no jumpers should be
installed on any of the jumper blocks.
Boot block jumper
If the BIOS has become corrupted, such as from a power failure during a flash update,
you can recover the BIOS using the boot block jumper and a BIOS flash diskette. See
“Recovering BIOS” on page 138 for information about the boot block jumper.
System board switch block
The switch block contains microswitches 1-8. As shown in this illustration, switch 8 is
at the top of the switch block and switch 1 is at the bottom. The Off positions of the
switches are on the side nearer the diagnostic LEDs.
Boot block
jumper (J37)
System board
switch block (SW1)