IBM Aptiva Hardware Handbook page 44

You send commands to a fax modem (or the fax portion
of a data modem) using a revised version of the AT com-
mand set. This revised version includes two different
sets of commands: Class 1 and Class 2. Some modems
support one class of command while others support
both. When buying a fax software application, choose
the highest class that your modem supports. The
modem in your computer supports class 2 fax
machines.
CAS and SENDFAX are two other commonly used com-
note: mand sets. These command sets are not supported by the
modems already installed in IBM Aptiva PCs.
32 How modems work
Communications settings
The modems already installed in IBM Aptiva PCs are
preset to COM1 SERIAL PORT 1. The addresses and
interrupts supported by your computer are:
COM # Address
COM1 3F8
COM2 2F8
COM3 3E8
COM4 2E8
Changing modem addresses for the Mwave
adapter card
The modem address in your communications software
must match the address setting of your modem. To
change the modem address settings, following these
steps:
1.
If you are using OS/2 Warp, double click on the
Mwave for OS/2 icon on the OS/2 desktop.
If you are using Microsoft Windows, double-click
on the Mwave icon on the Program Manager
screen.
2.
Double-click on the Hardware Configuration
icon.
Interrupt
IRQ 4
IRQ 3
IRQ 4
IRQ 3