An electrically programmable ROM is provided for avoiding frauds by producing, internally in the memory, the different potentials which it uses for verifying the memory points chosen. The verification of writing of information in a point is obtained by subjecting this point to a calibrated selection voltage, to which an external operator cannot have access. This calibrated voltage is produced by a multiplying generator. This latter feeds into one or more calibrators for producing all the useful voltages. Reading and writing orders are then given to a switching circuit which causes the corresponding application of these calibrated voltages. An external operator cannot enter in the memory level falsified signals for modifying the meaning of the contents of the recorded information.