Rare RMI Keyboard Computer KC-2 1975 First Digital KeyboardNotes Introduced in 1974, the Keyboard Computer was the world's first digitized portable musical keyboard instrument. The advanced technology used in the Allen Organs was incorporated into a portable case, with it's own unique voicing. There were two model manufactured in this series of instruments, which were geared towards the professional musician (The KC 1 and the KC 2). This model, the KC 2 was introduced in 1975 and ended its production run in