| 摘要 |
PURPOSE:To obtain a comparatively simple hardware which can use a conventional software as it is, and does not impose at all on an operating system, by utilizing sufficiently the effectiveness of a computer composite system by a common bus coupling system. CONSTITUTION:An IN1 instruction of a processor P1 sends a bus use request signal to a bus control part 40, receives a bus use permitting signal from the bus control part 40, the IN1 instruction is allowed to flow to a common bus 50, and a shared memory Rm receives the IN1 instruction and executes a prescribed processing. On the other hand, a trapping device 30 traps the IN1 instruction flowing on the common bus 50, sets a storing circuit 32 in the trapping device 30, and sends a bus holding signal to the bus control part 40 through a bus holding line 60. Accordingly, the processor P1 holds continuously the right of using of the common bus 50, even if the IN1 instruction of the processor P1 is ended, and subsequently, an OUT1 instruction of the processor P1 is executed. Especially, as for a computer composite system, an attention must be paid to a protection of resources, but this means can realize it by a comparatively simple hardware.
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