Little Board P6d Module
2-11
DMA channel not already in use. For your convenience, Table 2-7 and Table 2-8 pro vide a su mmary
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 c an set the prio rity in which interr upts are
assigned on Setup 6 — PCI Configuration Setup.
Table 2-7. Interrupt Channel Assignments
Interrupt Function
IRQ0
IRQ1
IRQ2
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
ROM BIOS clock tick function, from Timer 0
Keyboard interrupt
Cascade input for IRQ8-15
Serial 2, Serial 4
Serial 1, Serial 3
PCI
Floppy controller
Parallel port (option)
IRQ8
IRQ9
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
Reserved for battery-backed clock alarm
PCI
PCI, Serial 3, Serial 4
PCI
PS/2 Mouse, Serial 3, Serial 4
Reserved for coprocessor
Primary IDE hard disk controller
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.