Atari SX 212 Owner's Manual page 49

Pulse dialing
Rotary dialing; the older of the two methods used to
dial telephone numbers. (Each number dialed is represented by a
corresponding number of pulses, with zero represented by 10 pulses.)
See
Tone dialing.
RS232
A set of rules established by the Electronics Industries of
America (EIA) that standardizes the interface requirements between
modems and computers. The ATARI SX212 Modem has a standard
RS232 connector and can be connected to any computer with a
similar connector.
S Registers
Specific locations in memory where the modem's com¬
munication parameter settings are stored. The settings in the S reg¬
isters can be changed to customize the modem for special kinds of
communication.
Tone dialing
One of two methods used to dial telephone numbers;
synonymous with pushbutton or Touch-Tone dialing. See
Pulse
dialing.
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