23 Jul
1998
23 Jul
'98
5:30 a.m.
What is the official meaning of the symbol #?
BTW, in the UK # is _never_ called "pound".
"Hash" is the most usual
name, followed by "gate" and "hatch". "Pound" means a
script L with a
couple of horizontal bars through it :-)
How is 'recall' done? Where is the number stored? As for the
keypad configurations, I'm sure it all goes back to competing
calculator models.
That's what I was afraid of. Although a neater
hack still would be a
modified dial that did 11 pulses for * and 12 for #. Mechanically
possible, but I wouldn't want to try and modify the old dial.
There is a blanked-off hole in most type 746 phones that can
accommodate
1 or 2 buttons, and I was thinking of putting # and *
there, but this
is
more usually used for a "recall" button.
Incidentally, does anyone know why "timed break" recall buttons are
replacing local earth ones? And how long is the break?
> While a pulse-to-DTMF converter is a neat hack (and these sort of
> converters were installed in some step-by-step exchanges in the US,
at
> least there were in my local exchange when we were
step-by-step, but
come
> to think of it I don't know why, unless they
were converting my pulse
> dialed digits to DTMF so that some other adjunct piece of equipment
such
> as a Dialed Number Recorder could know what digits
I was dialing, for
> purposes of surveillance ;) it'd be easier to just buy a cheap DTMF
phone.
Sam, you should be ashamed of yourself. The object of the exercise was
not to get a DTMF phone, but to get one with a _rotary dial_. I
already
have a DTMF phone, and I am interested in thes project
_purely_ for
hack
value.
Slightly less far off topic, does anyone know the reason for the
divergence in layout between phone keypads and computer ones, i.e.
123 789
456 vs. 456 ?
789 123
0 0
Which came first?
Philip.
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