44
C.3 Interrupt Assignments
INTERRUPT #
INTERRUPT SOURCE
NMI
Parity error detected
IRQ 0
System timer
IRQ 1
Keyboard
IRQ 2
Interrupt from controller 2 (cascade)
IRQ 3
Serial communication port 2
IRQ 4
Serial communication port 1
IRQ 5
Available
IRQ 6
Standard floppy disk controller
IRQ 7
Parallel port (print port)
IRQ 8
Real-time clock
IRQ 9
Available
IRQ 10
Available
IRQ 11
Available
IRQ 12
PS/2 mouse
IRQ 13
Numeric data processor
IRQ 14
Fixed primary IDE controller
IRQ 15
Fixed secondary IDE controller
Ethernet IRQ is automatically set by the system.
C.4 1st MB Memory Map
ADDRESS DESCRIPTION
F000h-FFFFh System
BIOS
EF00h-EFFFh Expansion
ROM*
C800h-EEFFh Unused
C000h-C7FFh VGA
BIOS*
B000h-BFFFh VGA
DRAM
A000h-AFFFh VGA
DRAM
0000h-9FFFh Base
memory
* Default setting