programmed I/O (PIO) address
In 8100, the information specified as an operand of an I/O instruction that identifies the I/O device to be selected for a programmed I/O (PIO) operation.; 在IBM 8100信息處理系統(tǒng)中,被指定作為一條輸入輸出指令的操作數(shù)的信息,用它識別程序 輸入輸出(PIO)操作所選定的輸入輸出設備。