Abstract: Recovery of data from a store-to cache in a malfunctioning CPU, is accomplished without exercising the hardware of the malfunctioning CPU. A data path which is independent of the normal operating paths of the computer, such as a scan facility, is used to move data out of the cache into the mainstore while the malfunctioning CPU's clocks are off. A system controller controls normal transfer of data between the cache memory of the processing unit and the mainstore. A service processor is coupled to the processing unit, the mainstore, and the system controller, and is responsive to the detection of errors in the processing unit, for stopping the processing unit and moving data out of the cache memory to the mainstore through the scan facility separate from the system controller. Logic in the system controller flushes the move out queue or other storage locations in the system controller.