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Chapter 3 Hardware Description
3.8 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
IRQ0
IRQ1
IRQ2
IRQ8
IRQ9
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
3.9 Onboard PCI-IDE
The PCI-IDE controller, integrated in the VIA chipset, supports PIO
mode 3/4 and bus mastering Ultra DMA33/66. Using HDDs that support
Ultra DMA33/66, hard drive data transfer speed is increased for better
overall system performance. There are two IDE connectors - primary
IDE and secondary IDE. With two devices per connector, up to four IDE
devices can be supported.
3.10 DMA Channels
There are seven DMA channels available on the motherboard. Only
DMA2 is used by the floppy controller. In the case that ECP mode on the
parallel port is utilized, DMA1 or DMA3 will be used.
10
Function
System Timer Output
Keyboard
Interrupt Cascade
Real Time Clock
Software Redirected to Int 0Ah
Reserved
Reserved
Reserved
Co-Processor
Primary IDE
Secondary IDE
INTERRUPT
Serial Port #1
INTERRUPT
Floppy Disk Controller
Parallel Port #1
TI6VG4 User's Manual
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