Specifications

System BIOS and Resources
System Resources
Chapter 460
System Resources
System resources consist of:
• “PCI IRQ Lines” on page 60
• “IRQ Routing” on page 61
• “System Memory Map” on page 65
• “I/O Port Map (I/O Addresses Used by the System)” on page 65
• “DMA Channel Controllers” on page 67
• “Interrupt Controllers” on page 63
PCI IRQ Lines
PCI devices generate IRQs using up to four PCI IRQ lines (INTA#,
INTB#, INTC#, and INTD#).
PCI interrupts can be shared; several devices can use the same
interrupt. However, optimal system performance is reached when
minimizing the sharing of interrupts. Refer to “Interrupt Controllers” on
page 63 for a table of the PCI device interrupts.