Creative CT4180 Getting Started Guide - Page 23

Interrupt Request (IRQ) Lines, Direct Memory Access (DMA) Channels

Get Creative CT4180 - Sound Blaster 16 ViBRA Card PDF manuals and user guides View all Creative CT4180 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 23 highlights

Interrupt Request (IRQ) Lines An IRQ line is a signal line that a device uses to notify your computer's central processor that it wants to send or receive data for processing. Table A-2: Possible default IRQ line assignments for audio card devices. IRQ Line Device 5 Audio interface 11 IDE interface Direct Memory Access (DMA) Channels A DMA channel is a data channel that 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 A-3: Possible default DMA channel assignments for audio card devices. DMA Channel Usage 1 Audio Low DMA channel 5 Audio High DMA channel Understanding the Environment Variables Environment variables are used to pass hardware configuration information to software in your system. This section explains the environment variables of your audio card: u SOUND Environment Variable u BLASTER Environment Variable (only DOS applications use this) u MIDI Environment Variable (applicable only in DOS for the PLAY utility) Understanding the Installation A-3

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
Understanding the Installation
A-3
Interrupt Request (IRQ) Lines
An IRQ line is a signal line that a device uses to notify your computer’s
central processor that it wants to send or receive data for processing.
Direct Memory Access (DMA) Channels
A DMA channel is a data channel that 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.
Understanding the Environment Variables
Environment variables are used to pass hardware configuration
information to software in your system.
This section explains the
environment variables of your audio card:
SOUND Environment Variable
BLASTER Environment Variable
(only DOS applications use this)
MIDI Environment Variable
(applicable only in DOS for the PLAY utility)
Table A-2:
Possible default IRQ line assignments for audio card devices.
IRQ Line
Device
5
Audio interface
11
IDE interface
Table A-3:
Possible default DMA channel assignments for audio card devices.
DMA Channel
Usage
1
Audio Low DMA channel
5
Audio High DMA channel