assembly counting uppercase letters -

i want create program in assembly reads string characters user , displays number of uppercase letters entered. i'm using emu8086 run assembly programs. can;t seem find right program codes.i'm newbie , wanted @ least understand how language works symbols used. need representation of valuable codes counting of uppercase letters. thanks.

you don't tell know. here basic code count uppercase characters.

... counter cx cleared beforehand  ... here al contains character!  cmp al,"a" jb  skip cmp al,"z" ja  skip inc cx     cx hold result skip:  ... here control loop iterate on entire string