作者chanwen (Te quiero!)
看板PangSir
标题[问题] 关於第四章投影片Part1 第32页的练习
时间Sun Nov 7 21:54:55 2004
投影片上是
mov al, -128
neg al ; CF = 0, OF = 1
mov ax, 8000h
add ax, 2 ; CF = 0, OF = 0
mov al, -5
sub al, +125 ; CF = 1, OF = 1
可是我实际在电脑上执行得到的结果却是
mov al, -128
neg al ; CF = 1, OF = 1
^^^^^^
mov ax, 8000h
add ax, 2 ; CF = 0, OF = 0
mov al, -5
sub al, +125 ; CF = 0, OF = 1
^^^^^^
究竟是为什麽呢??
还是我的 assembler 比较奇怪??
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