23 Jul
1998
23 Jul
'98
7:04 a.m.
On Thu, 23 Jul 1998 Philip.Belben(a)powertech.co.uk wrote:
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.
Well, you could do that. However, here in the States, you'd most likely
end up confusing the telco switch. 11 and 12 pulses are not defined as
anything meaningful. What you'd have is 10 pulses (0) immediately
followed by another one or two pulses. I'd say the results are
unpredictable as to what the particular switch you are on would do. I
suspect the same is true for the UK phone systems.
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.
Yeah, I know, but the only problem with the exercise is that it would be
futile. There's simply no pulse equivalent to DTMF '*' and '#'. That
was
my point.
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
Computers are based on traditional ten-key numerical input
keypads and calculator keypads. The phone layout came later as touch tone
phones weren't introduced until around the late 60s or 70s.
Sam Alternate e-mail: dastar(a)siconic.com
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