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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