iam trying to convert the char i received to uppercase if it is lowercase if not leave it asit is . igot this code from net. but unable to understand why they added #224 at the end.
org 0000h mov acc,#'z' clr c subb a, #97 jc upper2 subb a, #26 jnc upper2 add a, #224 upper2: mov r0,a end