MegaPro Dual Pentium Pro PCI ISA Motherboard User’s Guide
14
Step 3 Set Additional Jumpers,
Continued
J11 Testing
J11 is a 2–pin berg used only for initial testing. Always leave J11 open.
Never place a jumper on J11.
J12 Chassis Door Open
J12 is a 2–pin berg that can be used to attach a wire to the chassis door
intrusion connector, if the chassis has this feature. The logic must be
set so that Pin 1 and Pin 2 are shorted when the chassis door is closed
and open when the chassis door is opened.
J14 SMI Select
J14 is a 3–pin berg that selects the SMI. Pins 1–2 should always be
shorted.
J18 Chassis Fan Connector
J18 is a 3–pin berg that pr12V power to the main chassis fan.
The chassis fan should provide a tachometer output on Pin 1, so it can
be monitored by the onboard server management hardware. The pinout
is:
Pin
Description
1
Fan Sense
2
Ground
3
+12V
J19 Enable Onboard PCI VGA
J19 is a 2–pin berg that enables or disables the onboard PCI ATI VGA
controller. The J19 settings are:
Onboard PCI ATI VGA
Setting
J19 Setting
PCI VGA Enabled
OPEN Default
PCI VGA Disabled
Shorted
J20 VGA Interrupt Enable
J20 is a 2–pin berg that enables interrupt support for the onboard PCI
ATI VGA controller:
Onboard PCI ATI VGA Interrupt Setting
J20 Setting
PCI interrupt enabled for onboard PCI ATI VGA
Controller
OPEN
PCI interrupt disabled for onboard PCI ATI VGA
Controller
Shorted Default
Cont’d
