I/O trunks

A trunk which can be connected to a peripheral control which handles both reading and writing (e.g.,a magnetic tape control connects to a pair of trunks). Data are transferred between main memory and a trunk (and a peripheral device) via the read/write channel specified in the instruction which initiates the transfer. Additional peripheral devices can be connected to the system simply by adding more I/O trunks to the basic configuration. The number of peripheral devices in a system depends only on the number of I/O trunks available.; 可以連接到管理讀寫的外部設備控制器上的一種干線(例如一臺磁帶控制器可以連接一對 線)。數據通過由啟動傳送的指令規定的讀寫通道在主存和一條干線(以及某一外部設備) 之間進行傳送。可以簡單地通過在基本配置上增加輸入輸出干線的方法將增加的外部設 備連接到系統上去。系統中的外部設備數僅取決于可用的輸入輸出干線的數目。