Tyan Computer GX21 - Manual (Page 72)

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APIC Mode
This option allows you to enable or disable Advanced Pro-
grammable Interrupt Controller (APIC) Mode. APIC mode
provides multi-processor interrupt management and incorpo-
rates both static and dynamic symmetric interrupt distribution
across all processors. In systems with multiple I/O sub-
systems, each subsystem can have its own set of interrupts.
Each interrupt pin is individually programmable as either
edge or level triggered. The interrupt vector and interrupt
steering information can be specified per interrupt. An indirect
register accessing scheme optimizes the memory space
needed to access the I/O APIC's internal registers. To
increase system flexibility when assigning memory space
usage, the I/O APIC's two-register memory space is re-locat-
able. The choices are:
Enabled / Disabled
Note: Once the operating system is
installed, such as Windows XP, this setting
cannot be changed without reinstalling the
operating system, regardless of whether the
initial setting is Disabled or Enabled.
MPS Version Control For OS
This feature is only applicable to multiprocessor mother-
boards as it specifies the version of the Multi-Processor
Specification (MPS) that the motherboard will use. The MPS
is a specification by which PC manufacturers design and
build Intel architecture systems with two or more processors.
MPS 1.1 was the original specification. MPS version 1.4 adds
extended configuration tables for improved support of multi-
ple PCI bus configurations and greater expandability in the
future. In addition, MPS 1.4 introduces support for a second-
ary PCI bus without requiring a PCI bridge.
Select the APIC mode depending on the operating system
installed: select 1.1 for Win NT 3.52, and 1.4 for Win NT4.0,
Win2000 and WinXP etc. The choices are:
1.4 / 1.1
Note: This option cannot be changed if the
APIC Mode is set to Disabled.