Asus TXP4-X User Manual page 46

IV. BIOS SOFTWARE
UART2 Use Infrared (Disabled)
When enabled, this field activates the onboard infrared feature and sets the second
serial UART to support the infrared module connector on the motherboard. If your
system already has a second serial port connected to the onboard COM2 connector,
it will no longer work if you enable the infrared feature. By default, this field is set
to Disabled, which leaves the second serial port UART to support the COM2 serial
port connector.
Onboard PCI IDE Enable (Both)
You can select to enable the Primary IDE channel, Secondary IDE channel, Both, or
Disable both channels (for systems with only SCSI drives).
IDE Ultra DMA Mode (Auto)
This sets the IDE UltraDMA to be active when using UltraDMA-capable IDE de-
vices. The BIOS will automatically adjust or disable this setting for slower IDE
devices so that Auto or high settings will not cause problems for older IDE devices.
Choose Disable if you do not want this feature for all devices.
IDE 0 Master/Slave PIO/DMA Mode, IDE 1 Master/Slave PIO/DMA Mode (Auto)
Each channel (0 and 1) has both a master and a slave making four IDE devices possible.
Because each IDE device may have a different Mode timing (0, 1, 2, 3, 4), it is necessary
for these to be independent. PIO and DMA timings can be independently set. The default
setting of Auto will allow autodetection to ensure optimal performance.
46 ASUS TXP4-X User's Manual