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ASUS P2-99B User’s Manual 55
IV. BIOS SETUP
IV. BIOS SETUP
Plug & Play / PCI
DMA x Used By ISA (No/ICU)
These fields indicate whether or not the displayed DMA channel for each field is
being used by a legacy (non-PnP) ISA card. Available options include: No/ICU and
Yes . The first option, the default setting, indicates either that the displayed DMA
channel is not used or an ICU is being used to determine if an ISA card is using that
channel. If you install a legacy ISA card that requires a unique DMA channel, and
you are not using an ICU, you must set the field for that channel to Yes.
ISA MEM Block BASE (No/ICU)
This field allows you to set the base address and block size of a legacy ISA card that
uses any memory segment within the C800H and DFFFH address range. If you
have such a card, and you are not using an ICU to specify its address range, select a
base address from the six available options; the ISA MEM Block SIZE field will
then appear for selecting the block size. If you have more than one legacy ISA card
in your system that requires to use this address range, you can increase the block
size to either 8K, 16K, 32K, or 64K. If you are using an ICU to accomplish this task,
leave ISA MEM Block BASE to its default setting of No/ICU.
SYMBIOS SCSI BIOS (Auto)
Auto allows the motherboard’s BIOS to detect whether you have a Symbios SCSI
card. If a Symbios SCSI card is detected, the motherboard’s Symbios BIOS will be
enabled; if no Symbios SCSI card is detected, the onboard Symbios SCSI BIOS will
be disabled.
Disabled will disable the motherboard’s Symbios SCSI BIOS so that the BIOS on
an external Symbios SCSI card can be used. (If your Symbios SCSI card does not
have a BIOS, the Symbios SCSI card will not function.)
USB IRQ (Enabled)
Enabled reserves an IRQ# for the USB to work, Disabled does not allow the USB to
have an IRQ# and therefore prevents the USB from functioning. If you are not using
any USB devices, you may set this feature to Disabled to save an extra IRQ# for
expansion cards.
VGA BIOS Sequence (PCI/AGP)
You can select the search order for your VGA card(s). PCI/AGP will detect PCI
VGA cards before AGP, and AGP/PCI will detect AGP cards before PCI VGA.