Enharmonic keyboard is a musical keyboard, where enharmonically equivalent notes do not have identical pitches. A conventional keyboard have, for instance, only one key and pitch for C sharp and D flat, but enharmonic keyboard have two different keys and pitches for these notes. Traditionally, such keyboards use black split keys to express both notes, but diatonic white keys may also be split.
As important device to compose, play and study enharmonic music, enharmonic keyboard may produce microtones and have separate keys for at least some pairs of not equal pitches that must be enharmonically equal in conventional keyboard instruments.
Read more about Enharmonic Keyboard: The Term (divergence of Scholar Opinions), Known Realizations