| 摘要 |
PURPOSE:To realize the change of the execution processing with an instruction simulation system by defining each bit of a rewritable work register in response to an executing routine, testing the corresponding bit in an instruction executing mode to change the executing routine and selecting the execution of prepared instruction groups. CONSTITUTION:The bits in a memory storing a program are allocated in response to instructions excluding a basic one and a work register consisting of plural bits that can be rewritten by instructions is provided on the executing part 6 of a processor 2. Then each bit is defined so that it corresponds to each executing routine in a control memory 5. Then a microprogram tests a bit 5, for example, to obtain the sum total of D1-D4 by executing its own microinstruction train when the bit 5 is equal to 0. Then the bit 5 is designated to 1 to obtain the value obtained by multiplying the sum total of D1-D4 by D5 via a soft instruction prepared in the memory 1.
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