The ASR33 - which stands for Automatic Send Receive - was the classic teletype. This is a dumb terminal for serial connection to computers. Input is via a keyboard of sculpted circular keys. Output is via a golfball onto continuous paper. The ASR33 also had a paper tape device for input and output. In use, the ASR33 is extremely slow (110 baud) and noisy. You can see a picture of one at http://www.wins.uva.nl/faculteit/museum/teletype_fs.html