Hardware Configuration and Installation
Chapter 2
VXI-AT2000/NI-VXI MS-DOS Getting Started
2-10
© National Instruments Corporation
Figure 2-4a shows the factory default DMA channel setting of the AT-MXI, with master-mode
DMA Channel 6 and slave-mode DMA Channel 3.
a. Factory Default DMA
Channel Jumper Setting:
Master Mode Channel 6,
Slave Mode Channel 3
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DACK7
DACK6
DACK5
DACK3
DACK2
DACK1
DACK0
W2
Slave
Master
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DRQ7
DRQ6
DRQ5
DRQ3
DRQ2
DRQ1
DRQ0
W1
b. DMA Channel Jumper
Setting
for Master Mode Channel 7,
Slave Mode Channel 0
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DACK7
DACK6
DACK5
DACK3
DACK2
DACK1
DACK0
W2
Slave
Master
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DRQ7
DRQ6
DRQ5
DRQ3
DRQ2
DRQ1
DRQ0
W1
Figure 2-4. DMA Channel Settings
To select a new DMA channel, move both the DRQ and DACK jumpers onto the appropriate
pins. Remember to make a corresponding change in the system software to enable the new
DMA channels. Figure 2-4b displays the jumper position for selecting master-mode DMA
Channel 7 and slave-mode DMA Channel 0.
