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B-4 Understanding the Installation
SOUND Environment Variable
The SOUND environment variable specifies the directory location of
your audio card’s drivers and applications. The syntax for this
variable is as follows:
SOUND=
path
where
path
is the drive and directory of the card’s software
(e.g., C:\SB16 ). No space is allowed before and after the equal sign.
BLASTER Environment Variable
The BLASTER environment variable specifies the base I/O address,
IRQ line, and DMA channels of the audio interface. Its syntax is:
BLASTER=A220 I5 D1 H5 P330 E620 T6
The values shown earlier may be different for your system. No
space is allowed before and after the equal sign. However,
there must be at least one space between parameters.
The parameters in the command are described as follows.
Parameter Description
A
xxx
Specifies the audio interface’s base I/O address.
xxx
defaults to 220.
I
x
Specifies the IRQ line used by the audio interface.
x
defaults to 5.
D
x
Specifies the Low DMA channel used by the audio
interface.
x
defaults to 1.
H
x
Specifies the High DMA channel used by the audio
interface.
x
defaults to 5.
P
xxx
Specifies the MPU-401 UART interface’s base I/O
address.
xxx
defaults to 330.
E
xxx
Specifies the Advanced WavEffects synthesizer
chip’s base I/O address.
xxx
can be 620.
T
x
Specifies the card type.
x
must be 6.