84h+8dh=111h,因为累加器a是八位的，所以进位标志位cy置一，a为11h
(A) = 7AH + A5H + 1 = 20H(PSW) = 1 1 0 0 0 0 0 1 = C1H
a=7a+a5+1=30h psw=88h
