The software configuration of the card. mainCodeOnly(1) typically means that there is one and only one functionally complete set of code. mainAndStandbyCode(2) typically means that two independent functionally complete sets of code exist on the card. mainCodeWithBootSector(3) typically means that two independent sets of code exist on the card. The first set referred to as the main code, usually contains functionally complete code with the exception of being able to download software. The second set referred to as the boot code, usually only contains enough functional code to be able to download new software. mainAndStandbyWithBootSector(4) typically means that three or four sets of code exist on the card: main code #1, boot code #1, main code #2, and possibly a boot code #2. The functionality of the main code is typically more complete than the boot code, and the boot code most likely is the code that allows for software upgrades.