One other thing . . . you may find that the easiest way in which to do what
you've described is to use a single-chip micro. There are some which even
have special features to help you.
Dick
-----Original Message-----
From: Arfon Gryffydd <arfonrg_at_texas.net>
To: Discussion re-collecting of classic computers
<classiccmp_at_u.washington.edu>
Date: Wednesday, December 01, 1999 9:07 AM
Subject: Re: Teleco Question... More on my devious plan....
>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 $25.00.
>----------------------------------------
> Tired of Micro$oft???
>
> Move up to a REAL OS...
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> ("LINUX" for those of you
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Received on Wed Dec 01 1999 - 10:54:17 GMT