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Video Sleep Jumper J6A1
The video address jumper determines which I/O port the onboard Cirrus
Logic CL-GD5424 super VGA controller uses for its internal AT mode
setup port. The starting address of the default port is 03C3h. You will
probably not need to change the starting address unless you install a
video adapter card that creates an address conflict. To change the starting
address to 46E8h, do this:
1.
Remove the CPU module from slot CPU 1 to improve access to the
jumper. You may also want to disconnect the ribbon cable from the
System Management Interface Card (SMIC).
2.
Move the jumper to pins 2 and 3 (REG 46E8h) to change the
address.
3.
Replace the CPU module, the SMIC ribbon cable if necessary and
the side panel.
BIOS Program Boot Block Jumper J7C1
Note
This procedure should only be done by a qualified technical person because it
requires a special "Boot Block Update Utility." Contact your supplier or sales
representative for more information about this utility.
When this jumper is on pins 1 and 2, you cannot update the BIOS boot
block.
1.
Remove the CPU module from slot CPU 1 to improve access.
2.
Move the jumper to pins 2 and 3 to enable writing to the BIOS
boot block.
3.
Replace the CPU module and side panel.
BIOS Boot Block Jumper J7D2
The boot block jumper enables the BIOS flash memory special recovery
mode. The system BIOS can be corrupted, for example when the update
procedure is aborted due to a power outage. The flash memory contains a
protected area that cannot be corrupted. Code in this area is used to boot
the computer from drive A when the BIOS has been corrupted. After
booting, the flash memory update utility is used to recover the system
BIOS automatically from the BIOS recovery files on the diskette.
Note
If you have mapped the BIOS of an add-in board to any part of the E0000h address
range, you must either map it to another area or physically remove the board from
the system before a recovery procedure can be completed. You do not have to remove
add-in boards for normal BIOS updates.
T e c h n i c a l I n f o r m a t i o n
OWNER'S HANDBOOK 5-17
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