| 摘要 |
PURPOSE:To attain the on-line editing of programs at a high speed without giving any effect to a logical decoding operation, by providing a shadow memory to store the same contents as a logic memory and changing the contents of the shadow memory. CONSTITUTION:When a request is received for change of the contents of a logic memory 1, a CPU performs the changing operations to a shadow memory 2 for insertion, addition, deletion, etc. Here a logical decoding part 3 reads out successively the memory 1 for logical decoding processing. When the change is through with the memory 2, an editing end signal 13 is supplied to a read/ write control part 4. Then the part 3 reads out successively the memory 2 for logical decoding processing in the next scan mode. In this case, the data are transferred to the memory 1 from the memory 2 via a data buffer 6. Then the contents of the memory 2 are coincident with those of the memory 1 when the logical decoding processing is through with a single scan. Thus the memory 1 is used again for the logical decoding process at and after the next scan.
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