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Appendix D
PC Card Questions and Answers for Windows 3.1
©
National Instruments Corporation
D-3
DAQCard-DIO-24 User Manual
are being used for ROM access, then you know that C8000-D3FFF is an
invalid range for Card Services and should be changed to
CA000-D3FFF.
How can I find usable I/O addresses?
Identify usable I/O addresses by trial and error. Of the three resources
used—memory, I/O, interrupts—I/O conflicts will be low. You can use
the NI-DAQ configuration utility in Windows to diagnose I/O space
conflicts. When you have configured the NI-DAQ configuration utility
for a particular I/O space, save the configuration. If there is a conflict,
the configuration utility will report an error describing the conflict.
How do I find usable interrupt levels?
Some utilities, such as
MSD.EXE
, will scan the system and display
information about what is using hardware interrupts. If you have such a
utility, you can run it to determine what interrupts Card Services can
use. Card Services needs an interrupt for itself as well as one interrupt
for each PCMCIA socket in the system. For example, in a system with
two PCMCIA sockets, at least three interrupts should be allocated for
use by Card Services.
Keep in mind that utilities such as
MSD.EXE
will sometimes report that
an interrupt is in use when it really is not. For example, if the computer
has one serial port, COM1, and one parallel port, LPT1, you know that
IRQs 4 and 7 are probably in use. In general, IRQ5 is used for LPT2,
but if the computer does not have two parallel ports, IRQ5 should be
usable. IRQ3 is used for COM2, but if the computer has only has one
serial port, IRQ3 should be usable.
I run a memory utility, and it appears there is no memory available
for Card Services. What should I do?
You should remove your memory manager by commenting it out of the
CONFIG.SYS
file. Next, you can rerun the memory utility. Memory
managers often consume an enormous amount of memory, and you will
need to determine what memory is really usable by Card Services.
When you have determined what memory is available for Card
Services, reinstall your memory manager and make the necessary
changes to provide Card Services with the memory needed. We suggest
that you use the minimum amount of memory for Card Services,
namely 4 to 12 kB, which frees more memory for the memory manager.
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