HP Workstation x4000 hp workstation x4000 - Technical Reference manual - Windo - Page 64
PIC mode, Virtual wire mode, Symmetric I/O mode, I/O APIC Input, IRQ Description
![]() |
View all HP Workstation x4000 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 64 highlights
System BIOS and Resources System Resources NOTE I/O APIC Input INTIN15 INTIN16 INTIN17 INTIN18 INTIN19 INTIN20 INTIN21 INTIN22 INTIN23 IRQ IRQ15 PCINTA PCINTB PCINTC PCINTD TFPC IRQ SCI IRQ not connected ICH SMI (not used) IRQ Description ICH - Integrated IDE Controller (secondary) Three major interrupt modes are available: • PIC mode: This mode uses only legacy interrupt controllers, so the system can support only one processor. You can select this mode when you install Windows NT. • Virtual wire mode: This mode, which is implemented using the 82C59 interrupt and the I/O APIC controller, is used during boot time. The virtual wire mode allows the transition to the symmetric I/O mode. In the virtual wire mode, only one processor executes operations. • Symmetric I/O mode: This mode is implemented using the I/O APIC controller and allows for multiple processor operations. In PIC mode and virtual wire mode, PCI interrupts are routed to the INT line. In symmetric I/O mode, PCI interrupts are routed to the I/O APIC controllers and forwarded over an APIC bus to the processors. 64 Chapter 4
![](/manual_guide/products/hewlettpackard-workstation-x4000-hp-workstation-x4000-technical-reference-manual-windows-linux-a6068ie001-e0601-1ad8c57/64.png)