| 摘要 |
PURPOSE:To control input/output equipment without the intervention of a CPU and speed up processing by providing a multiaccess bus which connects respective I/O controllers independently of a CPU and performing input/output control. CONSTITUTION:The multiaccess bus 3 which connects the I/O controllers 4-6 is added to the constitution including a CPU1, the I/O controllers 4-6, I/Os 10-20, a CPU bus 2 connecting them, and I/O buses 7-8. For example, an input/output controller consists of a CPU bus controller 41, multiaccess bus controller 42, I/O processor 43 connected to those two controllers, and I/O driver 44 which drives the I/Os. Consequently, the CPU bus 2 is used normally to interchange information between input/output controllers according to contents indicated by the CPU1 as a master, and the bus 3 allows the processor 43 of the input/output controller to serve as either the master or slave.
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