Reprogrammable control apparatus

摘要: An electrically programmable and erasable ROM (EPROM) is accessed via a selector an address counter, all mounted on PC board which includes also regular VCC bus. The EPROM output lines feed circuit, parts of may be other boards. board, however, has additional terminals connected to the in addition protective circuit limiting voltage level case high reprogramming signals are applied by external unit some these for programming terminal. One latter connects input Schottky diode bus that protect from higher-than-normal supply needed during reprogramming.