US Robotics Sportster Operating Instructions Manual page 86

Technicians use the ROM Checksum to verify
information stored in the modem's Read Only
Memory. You can check the ROM Checksum
from any Terminal program by typing ATI1
and pressing ENTER. For information about
the specific modem you are using, click
Product to bring up the next screen.
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U M S
SING ODEM TATION
The "Product" screen displays the make and
model of your modem. It is the equivalent of
the ATI3 command.
Your modem is able to store two
configurations or "profiles." Only one can be
active at any time.