46 ASUS P2B User’s Manual
IV. BIOS SETUP
Onboard FDC Swap A & B (No Swap)
This field allows you to reverse the hardware drive letter assignments of your floppy disk
drives. Two options are available: No Swap and Swap AB. If you want to switch drive letter
assignments through the onboard chipset, set this field to Swap AB.
Onboard Serial Port 1 (3F8H/IRQ4)
Settings are 3F8H/IRQ4, 2F8H/IRQ3, 3E8H/IRQ4, 2E8H/IRQ10, and Disabled for
the onboard serial connector.
Onboard Serial Port 2 (2F8H/IRQ3)
Settings are 3F8H/IRQ4, 2F8H/IRQ3, 3E8H/IRQ4, 2E8H/IRQ10, and Disabled for
the onboard serial connector.
Onboard Parallel Port (378H/IRQ7)
This field sets the address of the onboard parallel port connector. You can select either:
3BCH / IRQ 7, 378H / IRQ 7, 278H / IRQ 5, Disabled. If you install an I/O card with a
parallel port, ensure that there is no conflict in the address assignments. The PC can
support up to three parallel ports as long as there are no conflicts for each port.
Parallel Port Mode (ECP+EPP)
This field allows you to set the operation mode of the parallel port. The setting Nor-
mal, allows normal-speed operation but in one direction only; EPP allows bidirec-
tional parallel port operation at maximum speed; ECP allows the parallel port to oper-
ate in bidirectional mode and at a speed faster than the maximum unidirectional data
transfer rate; ECP+EPP allows normal speed operation in a two-way mode.
ECP DMA Select (3)
This selection is available only if you select ECP or ECP+EPP in the Parallel Port
Mode. Select either DMA Channel 1, 3, or Disable.
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.
See IrDA-compliant infrared module connector under section III.
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 field autodetects Ultra DMA capability (for improved transfer speeds and data integ-
rity) for compatible IDE devices. Set to Disable to suppress Ultra DMA capability.
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. The default setting of Auto will allow
autodetection to ensure optimal performance
IV. BIOS
Chipset Features
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