Chapter 2
Hardware Configuration and Installation
© National Instruments Corporation
2-7
VXI-AT2000/NI-VXI MS-DOS Getting Started
The AT-MXI can use interrupt levels IRQ3, 4, 5, 6, 7, 9, 10, 11, 12, 14, and 15. Be careful when
re-assigning interrupt levels on the AT-MXI. Notice that most PC ATs use interrupt level 6 for
the diskette drive controller and interrupt level 14 for the hard disk drive controller. Other
interrupt levels might be used by standard logic devices on the motherboard so check your
computer documentation before changing interrupt levels.
Once you have chosen an interrupt level, place the jumper on the appropriate pins to select that
interrupt level. Use the two rows of pins farther from the card-edge connector to select the board
interrupt level, and the two rows of pins closer to the card-edge connector to select the MXIbus
interrupt level. Figure 2-3a shows the factory default interrupt jumper setting of the AT-MXI,
with board interrupt level 12 and MXIbus interrupt level 10.
a. Factory Default
Interrupt
Jumper Setting–
Board Interrupt Level 12,
MXIbus Interrupt Level 10
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IRQ15
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IRQ14
IRQ12
IRQ11
IRQ10
IRQ9
IRQ7
IRQ6
IRQ5
IRQ4
IRQ3
W3
To set MXIbus
Interrupt Level
To set Board
Interrupt Level
b. Board Interrupt Level 5,
MXIbus Interrupt Level 10
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IRQ15
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IRQ14
IRQ12
IRQ11
IRQ10
IRQ9
IRQ7
IRQ6
IRQ5
IRQ4
IRQ3
W3
To set MXIbus
Interrupt Level
To set Board
Interrupt Level
Figure 2-3. Board and MXIbus Interrupt Jumper Settings
To change to another interrupt level, remove the appropriate jumper from its current position and
place it on the new posts. Figure 2-3b shows the board interrupt level changed to IRQ5.
