汇编程序，显示错误信息show_err 。在调用DOS的文件管理功能时，如果出现错误，DOS处理程序将把进位标志位置1，并在AX中装入错误码，然后调用show-err程序将错误信息显示出来。错误码1~35、80~83各表示一种DOS错误，36~79为保留代码，其它代码（小于1或大于83）为无效代码。show-err程序，根据AX中的错误码分别显示错误信息，保留代码信息或无效代码信息(使用debug命令调试)。-Assembler displays an error message show_err. When calling DOS file management functions, if an error occurs, DOS handler will carry flag is 1, and loaded error code in AX, and then call the program will show-err error message is displayed. Error Code 1 to 35.80 to 83 each shows a DOS error codes 36 to 79 are reserved, other code (less than 1 or greater than 83) to be invalid code. show-err program, according to the error code in AX displays an error message, reserved code information or invalid code information (using the debug command debug) respectively.