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From: hbg6@citek.mcdphx.mot.com
Newsgroups: sci.electronics
Subject: Re:PC interfacing and DTMF
Message-ID: <14559@mcdphx.phx.mcd.mot.com>
Date: 11 Feb 91 12:23:55 GMT
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References:<1290@cameron.egr.duke.edu! <823@ssc.UUCP> <14525@mcdphx.phx.mcd.mot.com> <1991Feb8.013313.13624@amd.com>
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In article <1991Feb8.013313.13624@amd.com> lpdjb@brahms.amd.com (Jerry Bemis) writes:
>What type od pub. is Circuit Cellar?  Does the artical include DTMF?
>if so could you send me a copy of it?
> 

Circuit Cellar Ink is a hardware/software magazine with an 'I'd rather
build it myself' attitude. The technical level of most of the construction
articles is somewhere between Radio Electronics Magazine and a BSEE.
They are at (215)630-1914.

The article in question, Feb/Mar issue 19, pg.22, 'A PC Stopwatch', details
a software controlled stopwatch which one could use to measure run times
of program segments as well as other things I suppose. I just took the
left half of their schematic ( the bus interface/address decode section ) and
spliced my DTMF decoder to it. Now that I look at it, the interface is
pretty simple, I'd just never 'hacked' one before.

The board ran all weekend time/date stamping DTMF transmissions over the
local police channels and worked well. ( NO the goal is not to record
numbers dialed on cordless phones, though the board will work well in
that application, this is a telemetry project).

John

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Someday my sysadm will decide this is a 'real' problem. :-)
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All opinions expressed are mine and not Motorolas, their loss.
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