Programmable Interrupt Controller

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I have a D820LP motherboard for a Dell, and I'd like to find the
Programmable Interrupt Controller chip on it and see how it's
connected to the CPU.  I've looked all over the board, and I don't
see anything that says 8259A or APIC.  Any ideas how to find this?

Or, does anyone have any photos showing a PIC connected to a CPU?


Re: Programmable Interrupt Controller wrote:
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If the ICH0 Southbridge is on your motherboard (because I'm not
certain of the chipset details)...

82801AA / 82801AB Southbridge ICH / ICH0

PDF page 3 says ICH0 Southbridge has inside it:

   "Interrupt Controller
    -Two Cascaded 82C59
    -Integrated I/O APIC Capability
    -15 Interrupts Support in 8259 Mode,
     24 Supported in I/O APIC Mode.
    -Supports Serial Interrupt Protocol"

And on PDF page 34 it explains the interrupt interface on the ICH0.


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