System memory map specifications

 

Size

Memory address

System function

 

 

 

 

 

640 KB

00000000-0009FFFF

Base memory

 

 

 

 

 

128 KB

000A0000-000BFFFF

Video memory

 

 

 

 

 

64 KB

000C0000-000CFFFF

Video BIOS

 

 

 

 

 

64 KB

000E8000-000FFFFF

System BIOS

 

 

 

 

 

 

00100000- XFFFFFFF

Extended memory (based on memory

 

 

 

installed)

 

 

 

 

 

 

(X+1)0000000-FEDFFFFF

PCI bus

 

 

 

 

 

 

FED00000-FED003FF

High precision event timer

 

 

 

 

 

 

FEE01000-FFFFFFFF

PCI bus

 

 

 

 

System interrupt specifications

 

 

Hardware IRQ

System function

 

 

IRQ0

System timer

 

 

IRQ1

Standard 101-/102-key or Microsoft Natural Keyboard

 

 

IRQ8

System CMOS/real-time clock

 

 

IRQ12

Synaptics PS/2 TouchPad

 

 

IRQ13

Numeric data processor

 

 

IRQ16

Intel ICH9 Family USB universal host controller 2937

 

Mobile Intel 4 Series Express Chipset Family

 

 

IRQ17

High definition audio controller

 

Intel ICH9 Family USB universal host controller 2938

 

Marvell Yukon 88E8072 PCIE-gigabit Ethernet controller

 

 

IRQ18

Intel ICH9 Family USB universal host controller 2939

 

Intel ICH9 Family USB universal host controller 2936

 

 

IRQ19

Intel ICH9 Family USB2 enhanced controller 293C

 

 

IRQ20

Intel ICH9 Family USB2 enhanced controller 293A

 

Intel ICH9 Family USB universal host controller 2934

 

 

IRQ21

Intel ICH9M-E/M SATA AHCI controller

 

 

IRQ22

Intel ICH9 Family USB universal host controller 2935

*Default configuration; audio possible configurations are IRQ5, IRQ7, IRQ9, IRQ10, or none.

✎PC Cards may assert IRQ3, IRQ4, IRQ5, IRQ7, IRQ9, IRQ10, IRQ11, or IRQ15. Either the infrared or the serial port may assert IRQ3 or IRQ4.

✎For operating systems after Windows 2000, APIC (Advanced programming interrupt controller) is used.

Specifications

6–6