Article View: sci.electronics
Article #15272Re: Tone frequencies on telephone
From: Henry Spencer
Date: Sun, 22 Nov 1992 01:29
Date: Sun, 22 Nov 1992 01:29
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In article <1992Nov19.174629.2336@netcom.com> kehoe@netcom.com (Thomas David Kehoe) writes:
>build a keypad with 0-9, #, *, and A-D. What you'd do
>with the A-D keys I don't know...
If memory serves, in some military phone systems they are used to indicate
the priority of a call (so that two stock clerks arguing about who was
responsible for losing a pair of boots get thrown off the line when NORAD
calls to announce incoming missiles).
--
MS-DOS is the OS/360 of the 1980s. | Henry Spencer @ U of Toronto Zoology
-Hal W. Hardenbergh (1985)| henry@zoo.toronto.edu utzoo!henry
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Newsgroups: sci.electronics Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!cs.utexas.edu!torn!utzoo!henry From: henry@zoo.toronto.edu (Henry Spencer) Subject: Re: Tone frequencies on telephone Message-ID: <By3G5B.EsC@zoo.toronto.edu> Date: Sun, 22 Nov 1992 01:29:34 GMT References: <1992Nov17.075719.23612@riacs.edu> <1eg588INNs78@uniwa.uwa.edu.au> <1992Nov19.174629.2336@netcom.com> Organization: U of Toronto Zoology Lines: 11