Figure 2-3. Board And Mxibus Interrupt Jumper Settings - National Instruments VXI-AT2023 Getting Started

Chapter 2
The AT-MXI can use interrupt levels IRQ3, 4, 5, 6, 7, 9, 10, 11, 12, 14, and 15. Be careful when
reassigning 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. It is possible that
various standard logic devices on the motherboard may use other interrupt levels, 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.
To set MXIbus
Interrupt Level
IRQ15
IRQ14
IRQ12
IRQ11
IRQ10
IRQ9
IRQ7
IRQ6
IRQ5
IRQ4
IRQ3
a. Factory Default Interrupt
Board Interrupt Level 12,
MXIbus Interrupt Level 10

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.
© National Instruments Corporation
To set Board
Interrupt Level
W3
Jumper Setting–
Hardware Configuration and Installation
To set MXIbus
Interrupt Level
IRQ15
IRQ14
IRQ12
IRQ11
IRQ10
IRQ9
IRQ7
IRQ6
IRQ5
IRQ4
IRQ3
W3
b. Board Interrupt Level 5,
MXIbus Interrupt Level 10
2-7 VXI-AT2023/NI-VXI ISC 386/ix Getting Started
To set Board
Interrupt Level