Web钱晓捷新版汇编语言程序设计习题答案修改钱晓捷新版汇编语言程序设计习题答案第1章 汇编语言基础知识1.17举例说明cf和of标志的差异.溢出标志of和进位标志cf是两个意义不同的标志 进位标志表示无符号数运算结果是否超出范围,运算结果仍然正确 WebApr 12, 2024 · 汇编语言中,CPU对外设的操作通过专门的端口读写指令来完成; 读端口用IN指令,写端口用OUT指令。 例子如下: IN AL,21H;表示从21H端口读取一字节数据到AL IN AX,21H;表示从端口地址21H读取1字节数据到AL,从端口地址22H读取1字节到AH MOV DX,379H IN AL,DX ;从端口379H读取1字节到AL OUT 21H,AL;将AL的值写入21H端口 …
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