| 摘要 |
A data processing system includes a main processor (11), programmed to have direct access to an I/O device, and a co-processor (22), also programmed to have direct acccess to an I/O (17,18,19) device, and an I/O device interconnected by a bus system to the main processor and the co-processor in such that both the main processor and the co- processor can have direct access to the I/O device, a transparent access trap being provided in the co-processor, effective on the co- processor and controlled by the main processor to selectively prevent the co-processor directly accessing the I/O device and to re-route trapped access requests to the main processor for execution thereby.
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