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Chapter 2
If you do not want to use DMA for AT-MIO-16D transfers, then place the configuration jumpers
on W12 in the position shown in Figure 2-5.
Figure 2-5. DMA Jumper Settings for Disabling DMA Transfers
Interrupt Selection
The AT-MIO-16D board can connect to any of the 11 interrupt lines of the PC AT I/O channel.
The interrupt lines for the MIO-16 and DIO-24 circuitry are selected by jumpers on one of the
rows of pins located above the I/O slot edge connector on the AT-MIO-16D (refer to Figure 2-1).
To use the interrupt capability of the AT-MIO-16D, you must select an interrupt line and place the
jumper in the appropriate position to enable that particular interrupt line.
The AT-MIO-16D can share interrupt lines with other devices by using a tristate driver to drive its
selected interrupt line. The interrupt lines supported by the AT-MIO-16D hardware for the MIO-
16 circuitry are IRQ3, IRQ4, IRQ5, IRQ6, IRQ7, IRQ9, IRQ10, IRQ11, IRQ12, IRQ14, and
IRQ15. The interrupt lines supported by the AT-MIO-16D hardware for the DIO-24 circuitry are
IRQ3, IRQ4, IRQ5, IRQ6, IRQ7, IRQ9.
Note: Do not use interrupt line 6 or interrupt line 14. Interrupt line 6 is used by the diskette drive
controller, and interrupt line 14 is used by the hard disk controller on most IBM PC ATs
and compatibles.
Once you have selected an interrupt level, place the interrupt jumper on the appropriate pins to
enable the interrupt line.
The interrupt jumper set is W13. The default interrupt lines are IRQ10 for the MIO-16 circuitry
and IRQ5 for the DIO-24 circuitry, which are selected by placing the jumpers on the pins in rows
5 and 10. Figure 2-6 shows the default interrupt jumper settings IRQ5 and IRQ10. To change to
another line, remove the jumper from IRQ5 or IRQ10 and place it on the new pins.
Figure 2-6. Factory Interrupt Jumper Settings IRQ5 (DIO-24) and IRQ10 (MIO-16)
© National Instruments Corporation
R7
A7
R6
A6
R5
A5
W12
MIO IRQ
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6
7
9 10 11 12 14 15
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W13
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DIO IRQ
2-7
Configuration and Installation
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AT-MIO-16D User Manual
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