In article <470aed52$0$24344$>,
lid says...
> I'm aware of the fact that ACPI and APIC are two
> different things and would not normally be listed
> together, as you say. I just thought that info on what
> APIC is would be helpful to the OP as well as the info
> you provided regarding ACPI, but in a more compact form.
> ;-)
> On my nForce2 NF-7 MB system, APIC is disabled as well
> (ACPI enabled to allow power options), as I had few
> devices to worry about sharing IRQs, and in some cases
> caused problems with audio if enabled.
> On my new system (P5B-Plus, E6600), with many more
> devices and an Intel chipset, APIC is enabled (along
> with ACPI, of course) with no dire consequences. :-)
I appreciate everybody's suggestions on this problem.
It seems pretty clear to me that the failure of XP to
install (but not Linux or 98SE) with APIC support enabled
means that there is almost certainly something wrong with
the motherboard. XP sets up its hardware tables based on
the motherboard showing APIC being enabled, but then when
the install process reboots to the hard drive for the first
time, with APIC now actually being used by XP, it doesn't
work, and the system hangs. But if I install XP with APIC
turned off in the first place, XP knows that, and doesn't
try to use it, and everything works fine.
I've found a reference somewhere on the net when reading
about this to the effect that APIC is required for
multiprocessors. But it's not clear whether that includes
multi-core single-chip processsors. It's clear that at
least one core of the Pentium D works with APIC support
disabled, but I wouldn't want the other core to be unusable
as a result. Anybody know about that, or know of a program
that will show whether both cores are actually working?