There are only two COM ports as standard in a PC. However, it is possible to
install additional ports by using a different I/O address - and this is what
a modem does when it installs as COM3 or COM4. The usual problem, however,
is that there is a limited number of IRQs in the PC. In most cases, COM3
will share IRQ 4 with COM1 and COM4 shares IRQ 3 with COM2. In your case,
the modem is apparently among the few that allows for additional IRQ
selection. How to set the IRQ depends on your specific modem. Whether this
is a Win modem (software modem) or not is a separate question from the I/O
address and IRQ that it uses.

Peter Shkabara
____________________________
[log in to unmask]
http://pesh.what.cc
-----Original Message-----
Have new modem installed on COM3, when there are actually just COM1 and
COM2. Does the fact that modem is installed on COM3 definitively state
this is software modem?

Modem software says modem should be installed on IRQ5 or IRQ7. Modem
installed on IRQ11. How can modem IRQ be changed to 5 or 7?

Demetri Kolokotronis

                Curious about the people moderating your
                   messages? Visit our staff web site:
                     http://nospin.com/pc/staff.html