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Chapter 3
BIOS Configuration
IDE Primary / Secondary Master / Slave PIO
The four IDE PIO (Programmed Input / Output) fields let you set a PIO mode (0-4)
for each of up to four IDE devices that the internal PCI IDE interface supports. Modes
0 through 4 provide successively increased performance. In Auto mode, the system
automatically determines the best mode for each device.
IDE Primary / Secondary Master / Slave UDMA
UDMA (Ultra DMA) is a DMA data transfer protocol that utilizes ATA commands
and the ATA bus to allow DMA commands to transfer data at a maximum burst rate of
66 MB/s. When you select Auto in the four IDE UDMA fields (for each of up to four
IDE devices that the internal PCI IDE interface supports), the system automatically
determines the optimal data transfer rate for each IDE device.
Init Display First
Select the type of display adapter used in your system.
IDE HDD Block Mode
Block mode is also called block transfer, multiple commands, or multiple sector read /
write. If your IDE hard drive supports block mode (most new drives do), select
Enabled for automatic detection of the optimal number of block read/writes per sector
the drive can support.
KBC Input Clock
Allows you to adjust the keyboard clock signal.
Onboard FDC Controller
Select Enabled if your system has a floppy disk controller (FDC) installed on the
system board and you wish to use it. If you install an add-in FDC or the system has
no floppy drive, select Disabled in this field.
Onboard Serial Port 1 / 2
Select a logical COM port address and corresponding interrupt for the first and second
serial ports. The second serial port offers infrared options in the next field.
UART Mode Select
Select an operating mode for the second serial port:
UART2 Duplex Mode
This setting allows the COM port to receive and transmit data simultaneously.
Default is at half duplex.
Standard
RS-232C serial port
IrDA
Serial infrared port
ASKIR
Amplitude shift keyed infrared port
