Radio Shack TRS-80 Modem II Operation Manuals page 33

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Rotary Dialing
Number Number Number Number
being
dialed
of
pulses
being
dialed of
pulses
1
1
6 6
2 2 7 7
3
3 8 8
4 4 9
9
5 5 10
Fast rotary
dialing:
20
pulses per second.
0.4-second pause
after
each number.
Slow
rotary dialing:
10 pulses per second.
0.8-second pause
after
each number.
Example
235-8214
Fast rotary dialing
Number
of
pulses:
2
+
3
+
5
+
8
+
2+1+4
=
25
pulses
Dialing
time:
25
pulses
/
20
pulses per
second
=
1
.25
second
Pauses: 0.4 seconds
X
7
numbers
=
2.8
seconds
Remember
to
add 2 seconds
for
each
P command!
Total time: 1.25 seconds
+
2.8 seconds
=
4.05 seconds
Slow
rotary dialing
Number
of
pulses:
2
+
3
+
5
+
8
+
2+1+4
=
25
pulses
Dialing time: 25 pulses
/
10 pulses per
second
=
2.5 seconds.
Pauses: 0.8 seconds
X
7
numbers
=
5.6 seconds
Total
time:
2.5 seconds
+
5.6 seconds
=
8.1
seconds
Tone
Dialing
Tone
dialing:
10 characters per second
Example
235-8214
7 characters
/
10 characters per second
=
.7
seconds
Remember
to
add 2 seconds
for
each
P command!
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