| 摘要 |
The system includes a microprogram memory (8) having address decoders (86,88) for activating a microinstruction selecting line (86U, 86V) in accordance with an applied address and memories (82,84) connected with the decoders through the selecting lines for storing microinstructions. The microinstructions having the common bit pattern in folds of the microinstructioin except a certain specific field arbitrarily noted, are modified so that an original microinstuction and assigned address can be restored by logically combining one or more modified microinstructions and assigned modified addresses.
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