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All channels in PCL-858 series share the same interrupt (IRQ), and
interrupt status register is available for determining the interrupt
source. Select an IRQ which is not already in use by another card in
the system. If you are installing more than one PCL-858, set them to
different IRQ number. Jumper Bank JP1 controls the card IRQ. Simply
place the jumper on the interrupt level as shown in the following
figure.
15 12 11 10 9
7
6
5 4
3
When data arrives at one of the eight ports, it will generate an
interrupt in the interrupt register. The software can read this, and
identify immediately which port generated the interrupt. This save
time, and makes programming easier. In DOS and Windows 3.1
environment, when a data bit of the interrupt status register is set to 0,
the corresponding channel is select to generate an interrupt, and vice
versa for Windows 95/98/NT system. If the bit is 1, then no interrupt
status register, and vice versa for Windows 95/98/NT system, as shown
in the following figure and table.
1 6
PCL-858
User's Manual
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