TYAN TIGER 133 Manual page 50

Chapter 3
BIOS Configuration
DE Prefetch Mode
The onboard IDE drive interface supports IDE prefetching for faster drive
accesses. If you install a primary and/or secondary add-in IDE interface, set
this field to Disabled if the interface does not support prefetching.
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.
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