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Understanding the Installation B-3

Interrupt Request (IRQ) Lines

An IRQ line is a signal line a device uses to notify your computer’s

central processor that it wants to send or receive data for processing.

Table B-2 lists an example of an IRQ line that may be assigned to the

audio interface on your audio card.

Direct Memory Access (DMA) Channels

A DMA channel is a data channel a device uses to transfer data

directly to and from the system memory. Your card’s audio interface

transfers data through the Low and High DMA channels.

Table B-3 shows a possible combination of DMA channels that may

be assigned to the audio interface.

Understanding the Environment Variables

Environment variables are used to pass information about how your

card is configured to programs in your system. This section explains

the environment variables of your audio card:

❑ SOUND Environment Variable

❑ BLASTER Environment Variable

❑ MIDI Environment Variable

Table B-2: Possible default IRQ line assignments.

IRQ Line Device

5 Audio interface

Table B-3: Possible default DMA channel assignments.

DMA Channel Usage

1 Audio Low DMA channel

5 Audio High DMA channel

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Creative AWE64 Manuale Utente Pagina 30