The earliest device that can be considered a 2-in-1 detachable is the Compaq Concerto from 1993. It came with Windows 3.1 and Windows for Pen Computing, and had a cabled detachable keyboard, and battery powered stylus.[23] In June 1994, IBM introduced the ThinkPad 360P, which features a display that can be rotated backwards and closed down into a pen-operated tablet.[24]