Abstract: A disk-cartridge-type adapter is capable of preventing damage to a head of the adapter and a head of a disk cartridge drive into which the adapter is inserted, even if these heads are deviated from each other. The adapter is also capable of effectively using the functions of the disk cartridge drive. The head of the adapter has a gap width and a head length that are sufficiently large to cover a setting error between the heads of the adapter and disk cartridge drive. The head of the adapter is covered with protective films having grooves. The head of the adapter has reinforcing supports each having a hollow in which the head of the disk cartridge drive moves. The head and supports of the adapter have holes for passing a shaft fixed to the adapter. The diameter of the holes is greater than that of the shaft. The adapter has a write-protect mechanism and a double-density detecting mechanism. The adapter has a card slot provided with a stepped part, and a hole used to extract an IC card from the adapter.

Abstract: A terminal device and a terminal system which are adapted for electronic money, excellent in operability and easy in the management of the electronic money. The terminal device used in combination with a host server has a function receiving a predetermined amount of electronic money from the host server when running start is instructed, a function of receiving the electronic money of the amount of payment from an IC card of a customer when a goods is bought, a function of transferring the electronic money to the host server so that when the internal balance of the electronic money exceeds an upper limit value of the balance, the balance of electronic money reaches a lower limit value of the balance, a function of transferring all the internal amount of electronic money to the host server, and other functions.

Abstract: A method of communication between an adapter and a drive improves the data processing efficiency of the adapter and data transfer efficiency between the adapter and the drive.The drive has a slot to receive a disk cartridge containing a disk and drives the cartridge. The adapter is shaped to be inserted into the slot of the drive. The adapter has a controller to transfer data between the adapter and the drive through the heads thereof. The controller formats data so that the formatted data may fit into at least part of a disk format having tracks and sectors handled by the drive. The controller assigns a specific one of the tracks to the formatted data and transmits the track with the data to the drive.