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Memory Management
Utility Conflicts
If you are using memory management
utilities (for example, QEMM or 386-
Max). it is important that you know
how to exclude the Ethemet adapter's
RAM address space from your
memory management driver This is
necessary because many memory
utilities use the area in memory nor-
mally used by the Ethernet adapter
The task of excluding the Ethernet
adapter's RAM base address space
from your memory management driver
is usually accomplished by a com-
mand line option in the CONFIG.SYS
file.
A similar situation exists with
programs such as Windows in 386
mode, which maps memory between
640 Kbytes and 1 Mbyte. Again, the
best solution is to exclude the Ether-
net adapter's RAM address space
from the memory rnanagernent driver
IRQ Level
A unique intermpt (IRQ) level must be
assigned to the Ethernet adapter. The
configuration options are IRQ 2,3,4,
5 , 7 , 1 0 , 1 1 , and 15.;
Some of these options are listed in
column 1 of Table 3. Columns 2 and
3 show the devices and computer
functions in an XT computer and in an
AT computer, respectively, that are
likely to use the IRQ levels shown in
column 1. For example, the hard disk
inside an XT is likely to use IRQ 5;
whereas the LPT2 port in an AT is like-
ly to use IRQ 5. Therefore, to avoid a
conflict, you should nofconfigure the
Etfiernet adapter to use IRQ 5 if you
have a hard disk.installed in your XT
computer, or if the LPT2 port is being
used in your AT computer
The same principle applies to the
other IRQ levels shown in Table 3.
Note that some IRQ levels may be use-
able for your LAN adapter even
though the chart indicates a conflict.
IRQ
.
2
3
.4
5
7
10
11
15
XT
EGAA/GA . .
COM2
COMl
HARD DISK
LFT1
N/A
N/A
N/A
AT
EGA/VGA
COM2
COMl
LPT2
LPTl
UNUSED
UNUSED
UNUSED
Table 3 . IRQ Levels of Common
Devices
22
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