Oke. I will set the memory cassette dipswitch to write enabled, but I am not undesthand about : "Use a host computer running SSS or a Programming Console to turn ON SR 27002 (the Compare UM to Cassette Bit). The data will be compared between the PC and the Memory Cassette. SR 27002 will be turned OFF automatically after the data comparison has been ompleted." I use to make a ladder to transfer program ? I don't know to add SR bit to transfer the new program. May be, can you attach a sample program ? I Have a CX-Programmer V.6.0 Thanks