Hardware
Interrupts
IRQ no. Function
1 IRQ0
I Timer output o
1 lRQ1
I Keyboard
1 IRQ2
I
Cascade to IRQ9
1 IRQ3
I
Serial port 2
1 IRQ4
1 Serial port 1
1 IRQ5
1 Available
I
IRQ6
1 Diskette drive controller
1 IRQ7
1 Parallel port 1
1 IRQ8
1 Real-time clock
1 IRQ9
1 Available
1 IRQ10 1 Reserved
1 IRQ11 1 Reserved
1 IRQ12 1 PS/2 mouse
IRQ13
IRQ14
IRQ15
Math coprocessor
Primary IDE controller
SecondaryIDE controller
System Memory Map
100000h-FDFFFFh
0C8000h-0DFFFFh
0A0000h-0BFFFFh
c
t
t
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
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