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This page will show you how to use a terminal program to get more information about your modem. Some of the information you may be able able to find includes:
Pick your terminal program
Windows 95/98 Modem Control Panel (can't do everything a terminal program can do, but it does report most ATI commands)
If using commands in the terminal program doesn't determine the manufacturer, see "Who Made my Modem?" You may be able to determine the manufacturer using the FCC numbers printed on the modem.