Patent US 3,976,990

An apparatus is disclosed for displaying subscript and superscript characters on the screen of a cathode ray tube. The encoded characters are selectively read from a memory which also provides two extended level outputs relating to the subscript and superscript features. In response to the readout of a superscript character from memory, a superscript signal, at the related extended memory output, is fed to an amplifier which, in turn, drives a superscript coil positioned about the neck of the cathode ray tube. This superscript coil generates a flux which reacts with the flux generated by the tube's vertical deflection coil during readout of the selected character thereby raising the position of that character on the screen. Correspondingly, a subscript signal at the related extended memory output results in the generation of a magnetic flux which reacts the vertical deflection coil field during readout of the selected character thereby lowering the position of that character on the screen.