TMC TI6NBF+, User Manual

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Chapter 3 Hardware Description
10 Pentium II/III ATX Motherboard User’s Manual
3.7 Interrupt Request (IRQ) Lines
There is a total of 15 IRQ lines available on the motherboard. Peripheral
devices use an interrupt request to notify the CPU for the service
required. The following table shows the IRQ lines used by the devices on
the motherboard:
Level Function
IRQ0
System Timer Output
IRQ1 Keyboard
IRQ2 Interrupt Cascade
IRQ8 Real Time Clock
IRQ9 Software Redirected to Int 0Ah or PCI Slot Int#
IRQ10 Reserved or PCI Slot Int#
IRQ11 Reserved or PCI Slot Int#
IRQ12 PS/2 Mouse or PCI Slot Int#
IRQ13 Co-Processor
IRQ14 Primary IDE
IRQ15 Secondary IDE
IRQ3 Serial Port #2
IRQ4 Serial Port #1
IRQ5 Parallel Port #2 or PCI Slot Int#
IRQ6 Floppy Disk Controller
IRQ7 Parallel Port #1
3.8 Onboard PCI-IDE
The PCI-IDE controller is a part of the Intel 82440BX AGPset or VIA
Apollo Pro Plus chipset. It supports PIO mode 3/4 and bus mastering
Ultra DMA/33. The peak transfer rate of PIO mode 3/4 can be as high as
17MB/sec. Using HDDs that support Ultra DMA/33, the peak transfer
rate can reach 33MB/sec. There are two IDE connectors - primary IDE
and secondary IDE. With two devices per connector, up to four IDE
devices can be supported.