ECS P4IBAS2 Manual page 57

USB Controller (Enabled)
Enable this item if you plan to use the Universal Serial Bus
ports on this mainboard.
USB Keyboard Support (Disabled)
Enable this item if you plan to use a keyboard connected
through the USB port in a legacy operating system (such as
DOS) that does not support Plug and Play.
USB Mouse Support (Disabled)
Enable this item if you plan to use a USB mouse.
AC97 Audio (Auto)
Enables and disables the onboard audio chip. Disable this
item if you are going to install a PCI audio add-on card.
AC97 Modem (Auto)
Enables and disables the onboard modem. Disable this item if
you are going to install an external modem.
Init Display First (PCI Slot)
Use this item to specify whether your graphics adapter is i n -
stalled in one of the PCI slots or is integrated on the
mainboard.
IDE HDD Block Mode (Enabled)
Enable this field if your IDE hard drive supports block mode.
Block mode enables BIOS to automatically detect the optimal
number of block read and writes per sector that the drive can
support and improves the speed of access to IDE devices.
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