IBM Aptiva Series, Handbook, Page: 73 / 164

Setup parameters 5-17
Maximum cacheable size
This parameter indicates the maximum cacheable size of
the external cache.
Memory parity mode
This parameter allows you to activate the Error Check and
Correct (ECC) feature. Select ECC to enable BIOS to detect
and correct data errors. Select Disabled if you do not wish to
use the feature. The default setting is Disabled.
PnP/PCI options
The parameters in the PnP/PCI Options menu allow you to
set the IRQ assignments for your PCI devices.
PCI IRQ setting
This parameter allows for automatic or manual configuration
of PCI devices. If you use Plug and Play devices, you can
keep the default setting as “Auto”. The system will
automatically configure installed Plug and Play devices.
If you install non-Plug and Play adapter cards, see “Adding
and removing adapter cards” on page 7-3.
If you have to configure PCI resources manually, use the up-
or down-arrow key to move between fields and select the
IRQ assignments using the left- or right-arrow key.
PCI slots
These parameters allow you to specify the appropriate PCI
devices. You may assign IRQ3, IRQ4, IRQ5, IRQ7, IRQ9,
IRQ10, IRQ11, IRQ12, IRQ14, or IRQ15 if they have not
been previously assigned to other devices. Some IRQs are
normally assigned to specific system devices. To avoid
resource conflicts, see “System interrupts” on page A-4 to
make sure the IRQ that you want to use is available.
Bus mastering
When set to Enabled, this option allows for the PCI cycles
not to pass through the CPU for faster operation. When set
to Disabled, all PCI transactions pass through the CPU. The
default setting is Enabled.
PCI IRQ sharing
When set to Yes, this parameter allows you to assign the
same IRQ to more than one PCI device installed in the
system. When set to No, you must assign different IRQs to
the PCI devices. The default setting is Yes.
VGA palette snoop
The VGA palette snoop function allows the system to refresh
all ISA and PCI graphic adapters installed in the system.
This is needed if you install an additional graphics overlay
card such as an MPEG or an advanced 3D graphics
adapter. If the image on your monitor has problems after
installing such an adapter, set this parameter to Enabled.
Otherwise, leave it set to the default (Disabled) to achieve
better performance.
Note:
When the PCI IRQ Setting parameter is set to Auto, all the
IRQ setting fields become gray and non-configurable.
v65xahb.book : chap-5.fm Page 17 Friday, January 16, 1998 4:27 PM