System information

Default Jumper Settings
A-3
Jumper Name Description Default Setting
J16 Fan fail
override
Allows the fan failure
detection logic to be
disabled to
accommodate alternative
enclosures.
This jumper is not
installed on AlphaServer
800 systems.
J22 Remote
management
console (RMC)
Sets default values to the
RMC NVRAM.
Disabled (as shown in
Figure A-1).
J27 VGA Enable When enabled (as shown
in Figure A-1), the on-
board VGA logic is
activated.
Enabled for onboard
VGA; Disabled if an
EISA- or PCI-based
VGA option is installed.
J50 Flash ROM
VPP Enable
Permits the 12V voltage
needed to update the
flash ROMs.
Jumper installed
(enabled).
J51 SCSI
Termination
Allows the internal SCSI
terminator to be
disabled.
Enabled (as shown in
Figure A-1.)
A.2 CPU Daughter Board (J3) Supported Settings
Figure A-2 shows the supported AlphaServer 800 5/400 settings for the J3 jumper on
the CPU daughter board. This jumper affects the clock speed and other critical
system settings.