Digital input-output display

Claim 1

A COMBINATION INPUT-OUTPUT DISPLAY FOR USE IN INSERTING INFORMATION INTO A COMPUTER AND READING OUT COMPUTED INFORMATION, COMPRISING: A DISPLAY DRUM HAVING A PRINCIPAL AXIS, SAID DISPLAY DRUM HAVING A PLURALITY OF SURFACES, THERE BEING A NUMBER OF VISUAL SYMBOLS UPON ONE OF SAID SURFACES, SAID SYMBOLS BEING RELATED IN POSITION AND MEANING TO A CODE ARRANGEMENT; A SEOND CODE ARRANGEMENT RELATED IN POSITION TO SAID SYMBOLS, AND RELATED IN MEANING TO A COMPUTER CODE, SAID SECOND CODE ARRANGEMENT BEING ON A SECOND SURFACE OF A DISPLAY DRUM; STATIONARY MEANS FOR SENSING BOTH OF SAID CODES; MEANS SUPPORTIONG SAID DISPLAY DRUM FOR AXIAL ROTATION, SAID DISPLAY DRUM HAVING A MAGNET THEREON RESPONSIVE TO A DIRECTIONALLY ORIENTED FLUX, AND A COIL ASSEMBLY INCLUDING A PLURALITY OF ARCUATELY ARRANGED COILS DISPOSED IN OPERATIVE PROXIMITY TO SAID MAGNET; A STATIONARY COMMUTATOR LOCATED PARALLEL TO A SURFACE OF SAID DISPLAY DRUM AND ARRANGED TO CORRESPOND IN NUMBER OF SEGMENTS AND THEIR POSITION TO THE ARCUATELY LOCATED COILS, WITH ONE END OF EACH COIUL ELECTRICALLY CONNECTED TO ONE SEGMENT OF THE COMMUTATOR; A WIPER ARM MOUNTED ON SAID DISPLAY DRUM AND CONTACTING ANY ONE OF SAID COMMUTATOR SEGMENTS AND SAID WIPER ARM ELECTRICALLY CONNECTED TO EXTERNAL CONTROL MEANS.