Registers – Records – Conductive
Patent
1995-09-28
1997-06-03
Hajec, Donald T.
Registers
Records
Conductive
235487, 235380, 902 4, 395730, 395732, 395601, G06K 1906
Patent
active
056357036
ABSTRACT:
A card storage medium accessible from several applications simultaneously has a storage unit, a communication control unit and a file access control unit. The communication control unit includes a command multiplex reception control unit for accepting a command on occasion received from the outside, while successively requiring the file access control unit to perform a command process according to the command accepted. The file access control unit includes an access exclusive control unit for inhibiting access to a file unit that is an object of a command process required by the command multiplex reception control unit if the file unit is already an object of an access for another command process. The card storage medium of this invention may be adapted to an IC card or an optical card which is necessary to comply with diversification or sophistication of users' demands.
REFERENCES:
patent: 4748320 (1988-05-01), Yorimoto et al.
patent: 5014192 (1991-05-01), Mansfield et al.
patent: 5408082 (1995-04-01), Takagi et al.
patent: 5506397 (1996-04-01), Hashino
patent: 5517014 (1996-05-01), Iijima
Fujitsu Limited
Hajec Donald T.
Lee Michael G.
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