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DOS功能调用基本上就是中断INT 21H的各个功能。调用过程分以下几步:①装入入口参数到规定的CPU寄存器中。②装入功能号及子功能号分别入AH,AL。③调用功能中断 INT 21H,如输入下列语句。
The DOS function call basically interrupts the various functions of INT 21H. The calling process points to the following steps: ① Load the entry parameters to the specified CPU registers. ② into the function number and sub-function number into AH, AL. ③ call function interrupt INT 21H, such as entering the following statement.