Television tuning system with means to prevent loss of information during power outages

摘要

A television tuning system with a circuit for preventing the loss of information during power outages is disclosed. A disable signal is generated in response to the interruption of a mains power supply. In response to the disable signal, a series of fixed signals are applied to at least one of the date and address terminals of a memory containing the information to be preserved. An appropriate signal for preventing the information stored in the memory from being changed during the period in which the disable signal is generated is also applied to the memory.