Method and apparatus for storing parity encoded data from a plurality of input/output sources

Abstract From the Canadian patent

Apparatus and method are included in the main memory of the data processing system which receives data from a plurality of input/output devices connected to a common bus. During a write cycle of operation a, device applies a plurality of data byte signals together with associated parity bits for writing into an addressed storage location of memory. Error detection and correction encoder circuits are connected to receive the data bits and parity bits and from them generate check code bits which are coded to signal selectively the presence of an uncorrectable error condition in accordance with the parity bits from a given source. During a read cycle of operation, error detection and …