Specifications
6–6
System memory map specifications
System interrupt 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
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.