Device for detecting whether an attached external memory stores

Details Device for detecting whether an attached external memory stores Device for detecting whether an attached external memory stores

1990-04-26

1993-10-26

Lee, Thomas C.

Registers

Coded record sensors

Particular sensor structure

235380, 400 61, 365201, 360133, 360135, 371 212, 3649521, 3649533, 364DIG2, G06F 1100, G06F 704

Patent

active

052573885

ABSTRACT:
In a data processing device capable of attachably and detachably providing an external memory unit to which data are written and from which data are read, the external memory unit being capable of storing data even when it is not provided on the data processing device, provided are discriminating means for discriminating whether the external memory unit is provided on the data processing device, judging means for judging whether predetermined kind of data are stored in the external memory unit in case that it is discriminated that the external memory unit is provided on the data processing device, and another judging means for judging at least whether the predetermined kind of data stored in the external memory unit are operable in case that it is judged by the judging means that the predetermined kind of data are stored in the external memory unit. Thus, since a conventional check operation for the external memory unit is not executed, in the data processing device according to the present invention, when the predetermined kind of data are stored, the predetermined kind of data are not destroyed.

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