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ASUS P2B-D2 User’s Manual 55
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 in-
clude: 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 deter-
mine 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, 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)
The default uses Auto settings for the onboard Adaptec 7890 SCSI BIOS. If you
do not want to use the onboard Adaptec 7890 SCSI BIOS, choose Disabled.
ONB AHA BIOS First (No)
This field allows giving priority to the onboard SCSI BIOS for SCSI functions
over other add-on SCSI controllers. The default is No.
ONB SCSI SE Term. (Enabled)
This allows you to enable or disable the onboard termination for single-ended
(SE) devices, such as scanners, CD-ROMs, or tape drives. The default is
Enabled.
ONB SCSI LVD Term. (Enabled)
This allows you to enable or disable the onboard termination for Ultra2 de-
vices, such as disk drives, using low voltage differential (LVD) technology.
The default for this field is Enabled.
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.