Ampro Corporation 5001451A manual Interrupt Function

Little Board P6d Module

DMA channel not already in use. For your convenience, Table 2-7and Table 2-8provide a summary of the normal interrupt and DMA channel assignments on the Little Board P6d module.

The PCI bus uses four interrupts (INTA*, INTB*, INTC*, and INTD*). These interrupts are mapped to any of the available ISA interrupts by the BIOS. If an expansion card has multiple functions, then more interrupts may be required. You can set the priority in which interrupts are assigned on Setup 6 — PCI Configuration Setup.

	Table 2-7. Interrupt Channel Assignments
Interrupt	Function
IRQ0	ROM BIOS clock tick function, from Timer 0
IRQ1	Keyboard interrupt
IRQ2	Cascade input for IRQ8-15
IRQ3	Serial 2, Serial 4
IRQ4	Serial 1, Serial 3
IRQ5	PCI
IRQ6	Floppy controller
IRQ7	Parallel port (option)
IRQ8	Reserved for battery-backed clock alarm
IRQ9	PCI
IRQ10	PCI, Serial 3, Serial 4
IRQ11	PCI
IRQ12	PS/2 Mouse, Serial 3, Serial 4
IRQ13	Reserved for coprocessor
IRQ14	Primary IDE hard disk controller
IRQ15	Secondary IDE hard disk controller

Note: IRQs for the Ethernet, Video, and Audio interfaces are automatically assigned by the BIOS plug and play logic.

PCI Interrupts assigned during initialization cannot be used by non-PCI devices.

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