JavaCard OS

Hi all in here. What differences are there between having an OS in EEPROM and having an OS in ROM? What about algorithms in EEPROM or ROM?

Could any one tell me the advantage and disadvantage between them? Thanks a lot.

When you load any code into ROM, it is harder to update again. But when the code is loaded into EEPROM, it can be updated any time. For development purposes you would like to use EEPROM to load the code.