A particular input/output processing unit which performs bidirectional data transfer between main memory and highspeed peripheral devices. Up to 32 devices can be attached to a selector IOP, but the high data transfer rates allow only one device to operate at a given time (in some computers).; 一種特殊的輸入輸出處理部件,實(shí)現(xiàn)主存儲(chǔ)器與高速外部設(shè)備之間的雙向數(shù)據(jù)傳輸。 在一臺(tái)帶選擇器的輸入輸出處理機(jī)上可以連接多達(dá)32臺(tái)設(shè)備,但在某些計(jì)算機(jī)上在給定 的時(shí)間內(nèi)只允許一臺(tái)設(shè)備進(jìn)行高速率的數(shù)據(jù)傳輸操作。