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Specifications
Maintenance and Service Guide 6–3
System DMA specifications
System interrupt specifications
Hardware DMA System function
DMA0 Not applicable
DMA1* Not applicable
DMA2* Not applicable
DMA3 Not applicable
DMA4 Direct memory access controller
DMA5* Not applicable
DMA6 Not assigned
DMA7 Not assigned
*PC Card controller can use DMA 1, 2, or 5.
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
Marvel 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.