Position discrimination device for a thumb wheel switch

摘要

A position discrimination device for a thumb wheel switch comprises a shift register and a ROM. The output data from the shift register and the data, determined by an inverted output from the shift register and by an output from a conductive terminal which corresponds to a state of the thumb wheel switch, are written into the ROM. The ROM supplies data to the shift register and generates a code signal corresponding to the state of the thumb wheel switch.