7 a• J½p
Assigned Device Interrupts
Although the l program can be used to change some of the settings, the following address map is not completely BIOS dependent, but is determined partly by the operating system. Note that some of the interrupts are allocated dynamically.
| JZRL L |
| Rp®®xv |
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Rt art |
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| R |
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INTA - PCI slot 3 (64/66) | P64H | IRQ0 | BT_INT |
| APIC bus |
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INTB - PCI slot 3 (64/66) | P64H | IRQ1 | BT_INT |
| APIC bus |
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INTC - PCI slot 3 (64/66) | P64H | IRQ2 | BT_INT |
| APIC bus |
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INTD - PCI slot 3 (64/66) | P64H | IRQ3 | BT_INT |
| APIC bus |
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INTA - PCI slot 4 (64/66) | P64H | IRQ4 | BT_INT |
| APIC bus |
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INTB - PCI slot 4 (64/66) | P64H | IRQ5 | BT_INT |
| APIC bus |
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INTC - PCI slot 4 (64/66) | P64H | IRQ6 | BT_INT |
| APIC bus |
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INTD - PCI slot 4 (64/66) | P64H | IRQ7 | BT_INT |
| APIC bus |
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INTA - onboard SCSI controller | P64H | IRQ8 | BT_INT |
| APIC bus |
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AGP - INTA, PCI Slot 1 - INTC, PCI | ICH | INTA | INT |
| APIC bus |
Slot 2 - INTA, PCI Slot 5 - INTB |
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PCI Audio - INTA, AGP - INTB, PCI | ICH | INTB | INT |
| APIC bus |
Slot 1 - INTD, PCI Slot 2 - INTB, |
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PCI Slot 5 - INTC |
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BT_INT, PCI Slot 1 - INTA, PCI | ICH | INTC | INT |
| APIC bus |
Slot 2 - INTC, PCI Slot 5 - INTD |
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USB - INTA, PCI Slot 1 - INTB, PCI | ICH | INTD | INT |
| APIC bus |
Slot 2 - INTD, PCI Slot 5 - INTA |
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Device on Primary IDE Channel | ICH | IRQ14 | INT |
| APIC bus |
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Device on Secondary IDE Channel | ICH | IRQ15 | INT |
| APIC bus |
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Serial Interrupt from Super I/O | ICH | SERIRQ | INT |
| APIC bus |
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1.In PIC mode, the Interrupts signaled to the P64H are chained as INTC to the ICH.
There are three major interrupt modes available:
haT I This mode uses only the “Legacy” interrupt controllers, so that only one processor can be supported. Because this system has dual processor capability, this mode is not chosen by default by Windows NT. However, during Windows NT installation, you have the possibility of selecting this mode.
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