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ECB-870
ECB-870 User’s Manual 91
Interrupt Usage.
The onboard Intel 82801BA provides an ISA compatible interrupt controller with
functionality as two 8259A interrupt controllers. The two controllers are cascaded to
provide 13 external interrupts.
The actual interrupt settings depend on the PnP handler, the table below indicates the
typical settings.
Interrupt Description Note
IRQ0 System timer
IRQ1 Standard 101/102-Key or Microsoft Natural Keyboard
IRQ2 Programmable interrupt controller
IRQ3 Communications Port (COM2)
IRQ4 Communications Port (COM1)
IRQ5 IRQ Holder for PCI IRQ Steering
IRQ5 Intel(R) 82801BA/BAM USB Universal Host Controller - 2444
IRQ5 Intel 8255x-based PCI Ethernet Adapter (10/100)
IRQ6 Standard Floppy Disk Controller
IRQ7 Printer Port (LPT1)
IRQ8 System CMOS/real time clock
IRQ9 IRQ Holder for PCI IRQ Steering
IRQ9 Intel(R) 82801BA/BAM USB Universal Host Controller - 2442
IRQ10 Intel(R) 82801BA/BAM SMBus Controller - 2443
IRQ10 Intel(R) GD82559ER PCI Adapter
IRQ11 IRQ Holder for PCI IRQ Steering
IRQ11 Intel(R) PRO/100 VE Desktop Adapter
IRQ12 PS/2 Compatible Mouse Port
IRQ13 Numeric data processor
IRQ14 Intel(R) 82801BA Ultra ATA Storage Controller - 244B
IRQ14
Primary IDE Controller (dual fifo)
IRQ15 Intel(R) 82801BA Ultra ATA Storage Controller - 244B
IRQ15 Secondary IDE Controller (dual fifo)