A method of organizing time sequential application data in an IC card, and an IC card having a structure for organizing such time sequential data. The IC card has an onboard microprocessor and an onboard semiconductor memory. Information is recorded in addressable application blocks defined for the purpose of receiving and recording application data. So long as unrecorded information blocks remain available, new application data is recorded in time sequential locations in those blocks and a record is kept of the sequence of recordation along with the block address at which the data is recorded. When all of the application blocks are filed, the last mentioned record is searched to determine the oldest data recorded in an application block, the new data is overwritten over that data, and the time sequential record updated. The time sequential record of data allows the onboard microprocessor to determine locations in its associated memory where data is to be stored independently of the application program while still allowing the application program to access the data at locations which are, in effect, unknown to the application program.