Environment 
Environment variables are used to pass hardware configuration information to the software in 
your system. For MS DOS, your audio card includes the following:
Variables
K
CTSYN Environment Variable
K
BLASTER Environment Variable
CTSYN Environment 
The CTSYN environment variable points to the location of the CTSYN.INI file, which usually 
Variable
resides in the Windows directory. The syntax for this variable is as follows:
CTSYN=path
where path is the location of the CTSYN.INI file.
BLASTER Environment 
The BLASTER environment variable specifies the base I/O address, IRQ line, and DMA 
Variable
channels of the SB interface. Its syntax is:
BLASTER=A220 I5 D1 H5 P330 T6
The parameters in the command are as follows.
This
Parameter
Specifies
A
xxx
SB interface's base I/O address.
I
x
IRQ line used by the audio interface.
D
x
First DMA channel used by the audio interface.
H
x
Second DMA channel used by the audio interface.
P
xxx
MPU 401 UART interface's base I/O address.
T
x
Card type. 
x
 must be 6.
SB Emulation in MS DOS/ Windows 95/98/ME B 5






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