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6–6 Maintenance and Service Guide
Specifications
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* Available for PC Card
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
IRQ2 Cascaded
IRQ4 COM1
IRQ6 Diskette drive
IRQ7* Parallel port
IRQ8 System CMOS/real-time clock
IRQ9* Microsoft ACPI-compliant system
IRQ12 Synaptics PS/2 TouchPad
IRQ13 Numeric data processor
IRQ14 Primary IDE channel
IRQ15 Secondary IDE channel
*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.