97
Device Interrupt Definition
C
Figure C-2 BIOS Default Connections for the PC Interrupt Logic Controller
8259 MASTER- PORTS $020-$021
IRQ0
IRQ1
IRQ2
IRQ4
IRQ5
IRQ7
IRQ8
IRQ9
IRQ10
IRQ12
PCI-to-PCI
INTA
PCI INTERRUPT
IRQ6
IRQ3
IRQ11
IRQ13
IRQ14
IRQ15
CPU
INTR
CONNECTIONS
MAPPED BY BIOS
PMC
Site
BRIDGE
C
P
C
b
u
s
Timer
Keybd
Com 2
Com 1
N/A
Floppy
Control
Interrupt
8-15
Lpt 1
Real-Tm
Clock
Mouse
Math
AT
Flash
Hard Drv
NA
NA
Coproc
PIRQ0 PIRQ1
PIRQ2
PIRQ3
IRQ2
INTB
INTC
INTD
Ethernet
MAPPER
8259 SLAVE- PORTS $0A0-$0A1
PIIX4E 82371EB
The PCI-to-ISA Bridge
PCI ISA IDE
Xcellerator
INT
IRQ15
IRQ14
IRQ13
IRQ12
IRQ11
IRQ10
IRQ9
IRQ8
INT
Drive
I
INTA
INTB
INTC
INTD
Bus
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