A doubleword at the location in main storage specified by the channel address word. One or more CCWs make up the channel program that directs data channel operations.; 由通道地址字指定的主存儲(chǔ)器中的一個(gè)雙字。一個(gè)或多個(gè)通道命令字組成一個(gè)控制數(shù)據(jù)通道 操作的通道程序。