Hear Again
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When I was a kid, I had one of those gigantic, green TTYs that were real TTYs, with the daisy wheel and the yellow paper. It made noise when it was on, and I still remember the smell of it. Comparing that huge thing with a BlackBerry is like comparing a '50s computer that took up an entire room with a modern PC or laptop. It's amazing how much technology has advanced in such a relatively short time.
The difference between the old TTY you describe vs. a Blackberry is similar to the difference between a Perkins Brailler and a Jot-A-Dot. (Note: The Jot-A-Dot is a small portable device that allows a blind person to write notes in Braille.) In comparison, the Perkins is twice the size of the Jot-A-Dot.