Abstract: A control for a dot matrix shuttle printer executing a sinusoidal velocity traversal across a line on a print medium comprises calculating the instantaneous position locations of the print elements during such traversal by making use of a lookup table. A dot image buffer stores information signals representing an entire line of desired dots to be printed. The calculated positions location information and the information signals are used to cause the desired dots to be printed in spatial sequence across a dot line at desired locations at the appropriate time during shuttle motion.

Abstract: A mechanical puzzle in the shape of a regular octahedron is provided, comprising a plurality of component octahedra and component tetrahedra. Such components are retained as a unit. The entire set of component parts which constitute a single face is adapted to be rotated 120 degrees about an axis perpendicular to any face.

Abstract: A method and apparatus for generating separated data and clock pulse trains from a composite pulse train of interspersed data and clock pulses where a predetermined number of successive clock pulses are absent from predetermined segments of the composite pulse stream. In the preferred exemplary embodiment, the first encountered pulse in the composite pulse stream is passed to a separated clock pulse train. Pulses thereafter occurring during subsequent alternating periodic time intervals are passed to the data pulse stream and to the clock pulse stream, respectively. Absences or non-occurrences of clock pulses in the resultant separated clock pulse stream are detected and counted. After counting a predetermined number of non-occurrences clock pulses in the separated clock pulse stream, the circuit is reset and all of the above recited steps are repeated. An exemplary circuit utilizing a plurality of interconnected monostable multivibrators for accomplishing such data separation is disclosed.