1. An apparatus for storing and retrieving original factory service mode data in a television set, comprising: a working memory initially containing the original factory service mode data that is normally accessible by a user and may become corrupted; and a reserved memory containing the same original factory service mode data that is normally not accessible to a user and is only accessible on a read only basis upon execution of a specific access operation so that the data may be copied to the working memory to restore the working memory to its initial condition.