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ASUS P2L97-S User’s Manual 51
IV. BIOS SOFTWARE
IV. BIOS
(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 Ye s.
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, 36K, or 64K. If you are using an ICU to accomplish this task,
leave ISA MEM Block BASE to its default setting of No/ICU.
Onboard AHA BIOS (Auto)
Auto enables the onboard Adaptec 7880 SCSI BIOS. If you do not want to use the
onboard Adaptec 7880 SCSI BIOS, choose Disabled.
ONB AHA BIOS First (No)
This allows you to select whether you want the onboard SCSI to boot first by select-
ing Yes or for an external SCSI card to boot first by selecting No.
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 do not use
USB devices, you may Disable this feature to save an extra IRQ# for expansion cards.