Hardware Interrupts
IRQ no.
Function
IRQ0
I
Timer output 0
lRQ1
I
Keyboard
IRQ2
Cascade to IRQ9
IRQ3
Serial port 2
IRQ4
Serial port 1
IRQ5
Available
IRQ6
Diskette drive controller
IRQ7
Parallel port 1
IRQ8
Real-time clock
IRQ9
Available
IRQ10
Reserved
IRQ11
Reserved
IRQ12
PS/2 mouse
IRQ13
IRQ14
IRQ15
Math coprocessor
Primary IDE controller
Secondary IDE controller
System Memory Map
Address range
FE0000h-FFFFFFh
100000h-FDFFFFh
0E0000h-0FFFFFh
0C8000h-0DFFFFh
0C0000h-0C7FFFh
0A0000h-0BFFFFh
000000h-09FFFFh
Function
128KB duplication of ROM BIOS stored at 0E0000h-0FFFFFh
System extended memory (128MB maximum)
128KB ROM BIOS
Adapter ROM BIOS
Video ROM BIOS
128KB video memory
640KB base memory
A-12
Specifications