HP Dc7700 HP Compaq dx7300 and dc7700 Business PC Technical Reference Guide, 1 - Page 65
The Advanced Programmable Interrupt Controller APIC mode provides enhanced interrupt, APIC Mode
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System Support APIC Mode The Advanced Programmable Interrupt Controller (APIC) mode provides enhanced interrupt processing with the following advantages: ■ Eliminates the processor's interrupt acknowledge cycle by using a separate (APIC) bus ■ Programmable interrupt priority ■ Additional interrupts (total of 24) The APIC mode accommodates eight PCI interrupt signals (PIRQA-..PIRQH-) for use by PCI devices. The PCI interrupts are evenly distributed to minimize latency and wired as follows: System Board Connector PCI slot 1 PCI slot 2 [1] PCI Expansion Connector (J30) [1] PCI slot 3 [1] PCI slot 4 [1] PIRQ A PIRQ B System Interrupts PIRQ C PIRQ D PIRQ E PIRQ F A B D A D A C D A B PIRQ G C B B A C PIRQ H D C C B D NOTES: [1] If present. The PCI interrupts can be configured by PCI Configuration Registers 60h..63h to share the standard ISA interrupts (IRQn). ✎ The APIC mode is supported by the Windows NT, Windows 2000, and Windows XP operating systems. Systems running the Windows 95 or 98 operating system will need to run in 8259 mode. Technical Reference Guide www.hp.com 4-13