Appendix D. Card Services Driver Software Notes
D-4
PC208W, Version 3.3, Instruction Manual
After setting aside this memory for use by Card Services, you may need to
configure Card Services itself to use this region. Please consult the
documentation provided with your specific Card Services drivers.
D.3.1 How to choose which area of memory to allocate to Card
Services
The address range used by Card Services can be from A0000 to FFFFF.
However not all machines will allow Card Services to use these addresses.
Many machines cannot use addresses below
C8000
or above
E8000
for Card
Services. If you are just extending the region of memory allocated to Card
Services, it may be best to leave the start of the region where it is, as you know
your machine is capable of using memory from that address.
Excluding a region of memory for use by other programs does not mean that
Card Services will be aware of it and be able to use it. The various
implementations of Card Services come with their own .INI files, that specify
the regions of memory Card Services will use.
Many implementations of Card Services also have setup programs which
automatically detect the free memory and create the .INI file accordingly.
Often such programs allow you to specify and modify the memory range to be
used by card services, to prevent Card Services from using a region which was
excluded for use by some other device such as a graphics card or network card.
A problem which sometimes occurs when configuring memory ranges is that
the setup program forgets which EMM386 exclude ranges were set for Card
Services, and so each time the setup program is run, greater regions are
excluded from EMM386. Because of this, it is advisable to keep a backup
copy of your CONFIG.SYS file until after you have finished making changes.
If your system is already set up in accordance with the above (and as described
in the Card Services supplier’s instructions) and SMS still fails due to lack of
resources, you may need to increase the size of your memory range. A range of
64K (example: D0000-DFFFF) should be plenty. Unless you have many other
specialized PCMCIA drivers you will not need to increase the size of this
range.
Please refer to the instructions which came with your Card Services driver
software and your Microsoft Windows manual for help in optimizing and
setting up your particular system.
Summary of Contents for PC208W
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