Abstract: Apparatus for converting code responsive, bail operated electric typewriter into an automatic typewriter. The apparatus includes discrete sensing, actuating or combined sensing-actuating assemblies disposed in existing cavities formed by the typewriter mechanism. Each assembly connects to the typewriter frame and is positioned to respond to various selection linkages in the typewriter or to actuate them. As each assembly separately mounts to and fits entirely within existing cavities, the overall profile of the typewriter mechanism does not change.