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, lowercase letters can be entered on the keyboard are displayed in capital letters (which requires the use of subroutines format, which uses the subroutine completed the conversion of lowercase letters to uppercase)