use the same chords as the Data Egg?
The BAT is similar in concept to the data egg, except the designers never identified portability as a problem to be addressed. The BAT chording scheme was based upon a physiological study done in Israel, where chords proven easy for the hand to press were mapped into the most commonly-used English letters. While this is theoretically the purest implementation possible, the alphabet seemed completely arbitrary to a newcomer, making it very difficult to learn. The Data Egg alphabet was developed in England for a BAT-like device called the Microwriter. (The company has since folded.) While it also used 7 buttons, the Microwriter alphabet was designed to be easy to learn.
