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From: dan@BBN-LABS-B.ARPA
Newsgroups: net.works
Subject: RE: ALPHAnumeric data-entry with Touch Tone phones ...
Message-ID: <2080@topaz.ARPA>
Date: Thu, 23-May-85 12:05:35 EDT
Article-I.D.: topaz.2080
Posted: Thu May 23 12:05:35 1985
Date-Received: Fri, 24-May-85 22:21:03 EDT
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Organization: Rutgers Univ., New Brunswick, N.J.
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From: Dan Franklin <dan@BBN-LABS-B.ARPA>

I know of one "standard" that was used by a couple of projects
within Bell Labs while I was there.  Each character is indicated
by two keypresses.  First you press the key containing the letter
or digit you want; then you press a second key "in the direction of"
the particular letter you want.  So if you wanted A, you would first
press the "2" key, then "1" (because "A" is the leftmost letter of
the three).  G would be indicated by pressing 4 twice, H by 4-5,
and so on.  I don't remember how they indicated digits, but you
could do that by following the initial key with 0.