In DECnet,a RSX software interrupt that occurs as a result of an external significant event such as completion of an I/O request. On occurrence of the event, control passes to an AST service routine.; 在DEC 網(wǎng)中的一種RSX軟件中斷,這種中斷是由于出現(xiàn)了一些類似于輸入輸出請(qǐng)求完成等 重要的外部事件而產(chǎn)生的。此時(shí),控制轉(zhuǎn)移到AST服務(wù)例程。