Installation guide

Appendix F Excluding Memory From Windows 373
3Com EtherLink II (3C503) and EtherLink 16 (3C507) Network
Adapters
The 3Com EtherLink II (3C503) and EtherLink 16 (3C507) network
adapters have a segment of shared RAM that must be excluded from use
by
Microsoft Windows. The starting address of this segment is the shared
RAM address; the size of the segment is the shared RAM buffer size.
The shared RAM address for these network adapters is configured by a
jumper on the network adapter (3Com refers to the shared RAM address
as the memory base address). If shared RAM is disabled on your
network adapter card (the default setting), you do not have to exclude
any shared RAM from use by
Microsoft Windows, so no changes are needed. If shared RAM is set to
a numerical value, use the value set as the starting address of the
segment to exclude. The shared RAM address on this network adapter is
given as a memory address (five hexadecimal digits). Convert this to a
paragraph address (which is needed for the next step) by dropping the
last zero. For more information about this jumper, see the manual for
these network adapters.
The shared RAM buffer size for this 3Com network adapter is 8K (or
0x200). For example, assume the shared RAM address for this network
adapter was 0xC800. Then the last address in the segment to exclude
would be 0xC9FF (0xC900 + 0x200 - 1). The line needed in the
SYSTEM.INI file would be:
Other Types of Network Adapters
If you are using a network adapter not listed here, read the
manufacturer’s documentation to determine if the card uses memory
that must be excluded from use by Microsoft Windows. If so, follow
the procedure described in “Excluding a Segment of Memory,” earlier
in this appendix, to exclude the memory indicated by the manufacturer.