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)