APOLLO Technical Manual
Jumpers and connectors
JP1 PCI – PCI Grant/PCI Auxiliary power selection
Used to select the functionality of PCI slot pin A14. There are two options available.
These are 3.3V PCI auxiliary voltage routed to the PCI slot or GNT4 routed. GNT4 is
made available to support a third PCI slot (via a riser card).
JP1 PCI
Description
3.3V PCI Auxiliary power to
PCI slot.
GNT4 to PCI slot.
Default setting:
JP1 Firmware hub – BIOS write protection
To enable BIOS write protection the jumper must be placed in position 2-3.
BIOS ECSD data cannot be updated when the write protect is in place. Any
devices added to the system with write protection enabled will not be reported
by the BIOS.
JP1 FWH
Description
BIOS firmware hub writeable.
BIOS firmware hub write
protected.
Default setting:
JP2 – User-configurable, CMOS reset and tamper detect
This consists of four individual jumper positions. Two of these are user-configurable
(USR1 and USR2). The third (CMOS) is used to clear the battery backed CMOS
memory, whilst the fourth (TPM) provides a tamper detect option. This is illustrated in
the following diagram:
USR1
USR2
CMOS
TPM
The individual positions are explained further in the following sections.
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