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cards is that many of them share COM4’s memory address space. This can conflict if
you try putting a modem on COM4. Please contact your graphic card company for
support on this issue. You need to determine which COM port and IRQ each serial
interface card in your system is using. One way to find this out is to open up your
computer, take out the expansion card or cards, and examine their jumper settings (be
sure the computer is turned off before removing an expansion card). Another simpler
way is to use Microsoft’s Diagnostics program.
Using Microsoft Diagnostics
Microsoft Diagnostics is a program included with most versions of MS-DOS. This
program tells you what is installed on each COM port and IRQ. Simply type
MSD at the
DOS prompt. If you are in Windows 3.1 or Windows for Workgroups, exit Windows
completely, then run MSD. If you are running Windows NT, click
Run , then type
WINMSD .
For Windows 95 users, click Start , point to Settings, and click Control Panel . Double-
click the System icon and then click the Device Manager tab. Double-click the
Computer icon. On the "View Resources" screen, make sure that Interrupt Request
(IRQ) is checked at the top. You will now be able to see what devices are assigned to
which IRQs, and which IRQs are free.