| 摘要 |
PURPOSE:To facilitate investigation of the cause of a bug of a program by storing successively an identifying data to identify a subroutine, in a memory at the time of executing the program, and reading out the identifying data from this memory at the time of a runaway and displaying it on a monitor. CONSTITUTION:When a CPU 7 executes a program and executes a prescribed processing or control, whenever plural subroutines are executed, a storage means stores successively a identifying data to identify its subroutine, in a memory area 9a. In case when the CPU 7 is brought to a runaway due to a bug of an executing program, when the CPU 7 is reset by pressing a reset button, or after it is reset, when the program is re-executed by a start signal;, an indicator (monitor) 12 reads out the identifying data from the memory by this reset signal or the start signal after the reset and displays it on the indicator 12. In such a way, which of plural subroutines is defective, or which part of an array combination of the subroutine is defective can be known. |
