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6–6 Maintenance and Service Guide
Specifications
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.