Measurement Computing CIO-DIO24 - Manual (Page 11)

CIO-DIO24 User's Guide Installing the CIO-DIO24
Hardware interrupt assignments
Name Description Name Description
NMI Parity IRQ8 Real Time Clock (AT)
IRQ0 Timer IRQ9 Re-directed to IRQ2
(AT)
IRQ1 Keyboard IRQ10 Unassigned
IRQ2 Reserved (XT) IRQ11 Unassigned
INT 8-15 (AT)
IRQ3 COM OR SDLC IRQ12 Unassigned
IRQ4 COM OR SDLC IRQ13 80287 MUNERIC CO-P
IRQ5 Hard Disk (XT) IRQ14 Hard Disk
LPT (AT)
IRQ6 Floppy Disk IRQ15 Not assigned
IRQ7 LPT
Wait state
The CIO-DIO24 board has a wait state jumper which you can set to enable an on-board wait state generator
(see Figure 4). A wait state is an extra delay injected into the processor's clock via the bus. This delay slows
down the processor when the processor addresses the CIO-DIO24 board, so that signals from slow devices
(chips) will be accepted. The wait state generator is only active when the CIO-DIO24 is being accessed. Your
PC will not be slowed down in general by using the wait state.
O
N
O
F
F
WAIT
STATE
Figure 4. Wait state jumper
Figure 4 The jumper is shown in is configured for
OFF
(wait state is disabled).
Because all PC expansion board busses are slowed to either 8 MHz or 10 MHz, the wait state will generally not
be required. If you experience sporadic errors from the 82C55 digital I/O chip (reset, port direction swaps), try
enabling the wait state generator.
Installing the CIO-DIO24
After you configure the base address, you can install the CIO-DIO24 into your computer. Follow the steps
below.
Install the MCC DAQ software before you install your board
The driver needed to run your board is installed with the MCC DAQ software. Therefore, you need to install
the MCC DAQ software before you install your board. Refer to the Quick Start Guide for instructions on
installing the software.
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