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Emoticons and Smileys on PLATO in the 1970s
Notes
"How were these things done? Well, on PLATO, you could press SHIFT-space to move your cursor back one space -- and then if you typed another character, it would appear on top of the existing character. And if you wanted to get real fancy, you could use the MICRO and SUB and SUPER keys on a PLATO keyboard to move up and down one pixel or more -- in effect providing a HUGE array of possible emoticon characters. So if you typed "W" then SHIFT-space then "O" then SHIFT-space then "B", "T", "A", "X", all with SHIFT-spaces in between, all those characters would plot on top of each other, and the result would be the smiley as shown above in the "WOBTAX" example. "
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