4 Dec
1999
4 Dec
'99
5:16 p.m.
It would be interesting to know, precisely, what it is you intend to do.
There's nothing difficult about any of the telco stuff, but unless you have
a clear and well defined, as well as well-specified, goal in mind, you'll
never get there. Now, if you just want to blink some LED's I'm sure you
can do that.
If you want to interrupt your LINUX box each time the phone rings, you can
do that in a number of ways. If you want to make a phone ring, that's easy
too.
I've looked through a lot of discussion about this subject, but still have
no idea in the world what exactly, it is you'd like to accomplish. Have
you?
Dick
-----Original Message-----
From: LordTyran <a2k(a)one.net>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Saturday, December 04, 1999 3:34 PM
Subject: Re: Teleco Question... More on my devious plan....
I have a schematic for a fone line emulator somehwere..
you can press a
button to make it ring and a few other things.. a bit complex and the
parts are estimated at around $100.
However, if you can force the linux box to answer and the micro to go into
term mode, you can use 2 9V batteries in series on one side of a phone
wire going between the modems.
Kevin
On Wed, 1 Dec 1999, Arfon Gryffydd wrote:
> First, Thanks to all who have helped so far...
>
>
> I have some old modems (TRS-80, acoustic and etc.) which I would like to
> use (flashing LEDs are cool) so, I want to build a little telco emulator
to
> interface with the modems in one of my Linux
boxes.
>
> I figure an LM556 for the dial tone... A tone decoder for dialing... Not
> sure an easy way to decode pulse dialing.
>
> As for ring... I am thinking using two charged capacitors and switching
> them. That's the first method I came up with to limit the current
cheaply.
Any suggestions? I'd like to do this for less that $25.00.
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