IBM Aptiva Series Hardware Maintenance page 48

Cache scheme
This item indicates the cache scheme when you enable the external cache
parameter. It turns grey when the external cache is disabled. The fixed setting
is Write Back.
The Write Back cache scheme allows updates in the cache but not in the
memory when there is a write instruction. The memory is only updated when
there is inconsistency between the cache and the memory.
PCI options
The parameters in the 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 Auto. The
system then automatically configures the Plug and Play devices. If you install
non-Plug and Play adapter cards, set this parameter to Manual. This allows
you to assign resources to non-Plug and Play cards first.
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. See "System Interrupts" on
page 1-12 to make sure that the IRQ that you want to use is free to avoid
resource conflicts.
Onboard PCI VGA
This parameter lets you to assign an interrupt for the onboard PCI VGA
device.
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.
General Information 1-29