Micron Technology Transport LT warranty Drivers and System Resources, IRQs, Windows Windows NT

Drivers and System Resources Drivers

Chapter 6 - Drivers and System Resources

Drivers

This section provides basic information about drivers and system IRQs.

A driver is a program that enables the Operating System to work with a hardware device. Your computer includes drivers for the audio, video, infrared, touchpad, keyboard, CD-ROM drive, hard drive, floppy drive, and PC Card controller. When you add a device to your computer, such as a printer, you install a driver for that device. Different drivers are used by different Operating Systems.

IRQs

Most of the devices in your computer are connected to your computer need their own IRQ (interrupt request line). The IRQ is a hardware line that a device can use to send signals to the microprocessor. When the device needs the microprocessor’s service, the device sends an interrupt request signal to the microprocessor.

The number of IRQs available for any computer is limited by industry standards. Because it ships with numerous features, this computer uses most of the available IRQs. If you add another device to your computer, you may need to disable an existing device to free up an IRQ for the new device. IRQ resources are of particular concern when the computer is attached to a docking device.

The default IRQ settings that are used by your computer are listed in Table 7.

TABLE 7. IRQs

IRQ	Windows 98	Windows NT 4.0	Windows 2000
0	System timer	System timer	System timer
1	Keyboard	Keyboard	Keyboard
2	Internal Controller	Internal Controller	Internal Controller
3	IrDA Port	COM 2, COM 4	IrDA Port
4	COM 1, COM 3	COM 1, COM 3	COM 1, COM 3
5	Audio/USB	Audio/USB	Audio/USB
6	Floppy controller	Floppy controller	Floppy controller
7	LPT1 (parallel port)	LPT1 (parallel port)	LPT1 (parallel port)
8	CMOS/Clock	CMOS/Clock	CMOS/Clock
9	ACPI bus SCI IRQ	Reserved	ACPI bus SCI IRQ

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