Proceed as follows to format the MMC. 1. Your CPU requests an overall reset (slow flashing of the STOP LED). 2. Put the switch into the MRES position and hold it there until the STOP LED lights permanently (approx. 9 seconds). 3. You must then release the switch within the next 3 seconds and then put it back into the MRES position. The STOP-LED now flashes during formatting. If the MMC cannot be formatted as described above, then the MMC is defective. NOTE: It is only possible to format the MMC if there is data located on the MMC that is invalid for the CPU. Otherwise the MMC is only initialized through the steps described.