试编写一个汇编程序，能对键盘输入的小写字母用大写字母显示出来（要求采用子程序格式，即采用子程序完成将小写字母转化成大写字母）-Try to write an assembler uppercase letters, lowercase letters of the keyboard input (requires a subroutine format using subroutine completed lowercase letters into uppercase letters displayed)