| 摘要 |
PURPOSE:To eliminate the need of the replacement of a component of a main memory even if, a fault occurs to the memory, by providing an error memory and substitute memory. CONSTITUTION:When an uncorrectable error occurs and error address Ej is detected, processor 5 writes ''1'' on disabling bit 12 of address Ej under the control of microprogram 4 and also writes ''1'' on substitute bit 11 of address Ej+1 while writing substitute address Aj of substitute memory 3 in address Ej+1. After the execution of arithmetic of Aj+2 to Aj and i+1 to i, the error bit in address (i) of error memory is set to ''1'' and error address Ej is stored. Therefore, the replacement of a component of the memory is unneded even if the main memory gets out of order. |
