System Board And Cpu Card Jumper Settings - DEC AlphaServer 1000A Owner's Manual

System Board and CPU Card Jumper Settings

Table 9-7 lists the default jumper settings for the system board. The jumper settings
are shown in Figure 9-6.
Table 9-7 System Board Default Jumper Settings
Number Name
J16 Large fan
J27 VGA enable
J50 FROM VPP enable Permits the 12 volts needed to update
J51 SCSI terminator
J52 Temperature
shutdown
J53 Fan shutdown
J55 Small fan
J56 Fan fault
9-12 Quick Reference
Description and Default
Allows the large fan to be disabled.
Enabled.
Enables the on-board VGA logic.
Enabled. Set to the disabled position
(pins 2 and 3) when using a graphics
option card.
the Flash ROMs. Enabled.
Enables the on-board SCSI
terminators. The system specification
requires that the SCSI bus be
terminated at both ends. Enabled.
Allows the temperature chips to shut
down the system in an orderly
sequence. Enabled.
Allows the software to shut down the
system in the event of a fan failure.
Enabled.
Allows the small fan to be disabled.
Enabled.
Allows hardware to detect a fan fault
and shut down the system in an
orderly sequence. Enabled.
Set to disable if testing the system
board or CPU card outside of the
enclosure.
AlphaServer 1000A Owner's Guide