TTYs for the deaf

From: Ashley Carder <>
Date: Sat Dec 11 12:51:49 2004

> Hello folks,
> I have a question about those TTYs that the deaf use. Are they real
> Teletypes, like ASR33 and friends, or not? I guess probably not, because
> it would be so super-cool if they were that it's probably too good to
> be true, but I thought I would ask anyway. So what are they? Are they
> normal ASCII terminals with standard modems built in, or something
> entirely different? Can one pretend to be deaf, go to some social service
> or whatever agency asking to use a deaf TTY, and dial into a timesharing
> host or BBS with it?
> It also seems like there are two kinds of deaf devices, TTY and TDD.
> What's the difference?
> MS

I have one of those that used to belong to a friend of mine who taught
deaf children. This one is a real TTY, but not ASR-33. It's the 5 bit
Baudot version from the 1940s, not the 8 bit ASCII.

I saw them use these things before. They hooked up an acoustical
coupler to the phone and dialed someone else who had a TTY. I suppose
instant messaging and other modern technologies have rendered the old
TTYs obsolete.

Received on Sat Dec 11 2004 - 12:51:49 GMT

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