APPARATUS FOR REDUCING STORAGE NECESSARY FOR ERROR CORRECTION AND DETECTION DATA

摘要

Present invention presents a novel mechanism for reducing the amount of storage space necessary to perform error checking and correcting in a storage unit of a data processing machine by utilizing the information present in the parity checking portion of the storage unit. The novel mechanism is based on generating an error checking and correcting code which includes a first portion identifiable by parity bits normally stored with data words in a data storage device and a second portion. The second portion contains fewer bits than required in the prior art for an equivalent level of error checking and correcting and only the second portion is stored. When data is moved out of the storage device, the first portion is identified from the parity bits.