Registers – Systems controlled by data bearing records – Credit or identification card systems
Patent
1991-02-06
1993-10-12
Shepperd, John
Registers
Systems controlled by data bearing records
Credit or identification card systems
235492, 235381, 395425, G06K 1906, G06F 900
Patent
active
052528120
ABSTRACT:
A program control system is provided for a portable data storage device. The portable storage device includes a main processing unit (MPU), a first memory which is a fixed memory of storing non-rewritable fixed programs to be accessed from the MPU and a second memory for which read/write for any program can be carried out by the MPU. The second memory includes a priority control management table for storing index information of several kinds of programs having the same program actuating numbers as those of the fixed programs stored in the first memory, and a program area for storing programs corresponding to the index information on the priority control management gable. A priority controller is provided in the first memory in order to search the priority control management table when a prescribed program is accessed by the MPU. If the index information of the prescribed program is present on the priority management table, the program in the program area designated by the index information will be executed. Whereas if the index information is not present, the pertinent program in the first memory will be executed.
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Chin Esther
Hitachi Maxell Ltd.
Shepperd John
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