| 摘要 |
PURPOSE:To improve the software productivity, the debug efficiency and the maintenance performance by using a selection key and its corresponding data processing part to process plural instruction inputs independently of each other. CONSTITUTION:When a screen selection key 17 is set at '0' for input of instructions, the instructions are stored temporarily to an instruction store part 16a and then to an instruction input store part 15a of a CPU1 when the input of an instruction is over. Then the instruction stored in the part15a is calculated after undergoing the instruction input interpretation 6. The result of this operation is stored to an arithmetic execution result store part 7a and then to a display data store part 14a via a control part 8 for display 12. When the key 17 is set at '1', the instruction input store parts 16b and 15b, an arithmetic execution result store part 7b and a display data store part 14b are used like the case where the key 17 is set at '0'. Then the display data stored in the part 14b is displayed at the part 12 via a display control part 13. Thus it is possible to process plural instructions substantially at a time.
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