Abstract: A card adapter for insertion of an IC card in a card slot of a receiving member of an electronic apparatus. The IC card is provided with card contacts and the receiving member is provided with a receiving member connector. The card adapter includes a base on which the IC card is positioned with the card contacts in registration with an opening in the base, a circuit board having circuit board contacts and a circuit board connector, and a cover supported on the base. The circuit board contacts project through the opening in the base to make electrical contact with the card contacts and the circuit board connector is connectable to the receiving member connector. The cover movable to a closed position at which it encloses the IC card and exerts pressure on the card contacts to maintain good electrical contact with the circuit board contacts.

Abstract: An object of the present invention is to provide a microcomputer capable of checking the data stored in a read only memory (ROM) integrally formed therein even without using any additional testing device, but an external ROM. In the test mode, a test signal TS to be fed to an external terminal 15 is set to a logic "1". By this operation, the output signal of a register 13 is fed to the address terminal A of the internal ROM 16 by way of a selector 14. Further, the data read out from the ROM 16 is outputted to a register 18 through a selector 17. On the other hand, by connecting the external ROM 30, in which a test program is stored, to an address terminal 21 and a data terminal 22. The CPU 11 can carry out the test program stored in the external ROM 30. By reading and comparing the data stored in the ROM 16 and the data stored in the external ROM 30 to be compared by the test program, the data in the ROM 16 can be checked.