| 摘要 |
PURPOSE:To count run steps without giving effect on the operation of an information processing system in operation, by connecting a count means which completes count when an instruction pickup address is coincident with a run completion address to a common bus. CONSTITUTION:A run step calculating circuit IC is connected to a common bus BUS indenpendently of a CPU. A head address MS of a count objective area at a main storage device MEM, a final address ME, a run start address RS indicating the start position of count, and a run completion address RE indicating the position of compoletion of count are respectively preset to registers R1-R4 of the circuit IC. In the IC, comparators CMP1-CMP4 are started by an instruction pickup signal E and an instruction pickup address AD is read without giving effect on the CPU or the main storage device MEM. |
