很着急 请大家能给予我最快的答复
设以下为8259A的初始化命令,请根据此初始化 序列说出:从片8259级联于主8259A的哪根据IR请求线;从片的IR2线对应的中断号为多少 ?该中断在中断向量表中得的位置为多少?;初始化主片8259A ;初始化从片8259A
MOV AL, 11H MOV AL, 11H
OUT 20H,AL OUT 0A0H,AL
NOP NOP
MOV AL,08H MOV AL,70H
OUT 21H,AL OUT 0A1H,AL
NOP NOP
MOV AL,04H MOV AL,02H
OUT 21H,AL OUT 0A1HH,AL
NOP NOP
MOV AL,11H MOV AL,01H
OUT 21H,AL OUT 0A1H,AL