8086汇编指令SUBB A, R5执行结果分析

( A )=0A7H, (R5)=68H, Cy =1，执行指令 SUBB A ,R5后 ( A )=［填空1] Cy =［填空2] Ac =［填空3] OV =［填空4] P =［填空5] 首先A不等于9FH和FFH内容：

( A )='FFH' Cy =1 Ac =0 OV =0 P =1 (因为'FFH'为负数，符号位为1，所以P为1)