DATA COPYING METHOD FOR DUPLEX EXTERNAL MEMORY DEVICE

PURPOSE:To shorten copying time by clearing the table corresponding to respective external memory devices by [0] at the time of changing from duplex operation to simplex operation, changing the bit position of a table from '0' to '1' each time writing is executed during separatio...

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Bibliographic Details
Main Author TANABE YOSHIICHI
Format Patent
LanguageEnglish
Published 23.04.1987
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRIC DIGITAL DATA PROCESSING
ELECTRICITY
PHYSICS
SELECTING
TELEPHONIC COMMUNICATION
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Summary:PURPOSE:To shorten copying time by clearing the table corresponding to respective external memory devices by [0] at the time of changing from duplex operation to simplex operation, changing the bit position of a table from '0' to '1' each time writing is executed during separation, obtaining the OR of respective tables at the time of the re-duplex operation and transferring the block only corresponding to the bit of '1'. CONSTITUTION:When shifting is executed from the duplex operation to the simplex operation, all bits of tables 11 and 12 are cleared to '0' by the processing. Next, by the processing during the separating operation, the bit of the table corresponding to the external memory device is changed from '0' to '1' only at the time of writing. Next, when shifting is executed to the duplex operation again, the OR of the tables 11 and 12 is obtained by a flow 61 and set to a table 13. Consequently, for the table, (0) for (0) word, one bit and one bit for one word, three places in total come to be '0' to '1'. By the processing, only the block corresponding to the bit where '1' of the table 13 is set is transferred from an external memory device (0)2 to an external memory device (1)3.
Bibliography:Application Number: JP19850229685