Creative audigy 5 Specifications download pdf (Page 60)

SB Emulation in MS-DOS/Windows 98 SE B-5

Direct Memory

Access (DMA)

Channel

A DMA channel is a data channel that a device uses to transfer data directly to and

from the system memory.

Environment

Variables

Environment variables are used to pass hardware configuration information to the

software in your system. For MS-DOS, your audio card includes the following:

❑

CTSYN Environment Variable

❑

BLASTER Environment Variable

CTSYN

Environment

Variable

The CTSYN environment variable points to the location of the CTSYN.INI file, which

usually 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

Variable

The BLASTER environment specifies the base I/O address, IRQ line, and DMA

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

Axxx SB interface’s base I/O address.

IRQ line used by the audio interface.

Table B-3:Possible default direct memory access (DMA) channel assignment.

Usage Default DMA Channel

First DMA channel 0,

, 3

Second DMA channel

, 6, 7

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 80 81

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Creative audigy 5 Specifications Page 60