Teleco Question... More on my devious plan....

From: awcl <>
Date: Wed Dec 1 13:12:41 1999

TRS-80 is the one of the early computers that could generate two
frequencies at once. You will have to write a small basic program and
need a amplifier to connect the tones to the line. It is not complicate
thing to do. All you need is get a Basic programming manual for TRS-80
and look for tone generating section. If I recall correct these tones
have different timings. 2600HZ for CCITT-5 is about 300ms and others

Hope this helps


John Foust wrote:
> At 10:03 AM 12/1/99 -0600, Arfon Gryffydd wrote:
> >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.
> You'd think it would be easy, and you think someone out there would
> have done it already. I wanted to do this once upon a time. It would
> seem like a great project for an old PC, a parallel port, a few
> junk-box relays and maybe a sound card. I think I mentioned this
> idea on this list a year or two ago, and Sellam (apparently a telco
> wizard) thought it could get complicated.
> - John
Received on Wed Dec 01 1999 - 13:12:41 GMT

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