char_to_lower:
            ; Char To Lower
            ; Char is converted to Lowercase

            ; Input:
            ; A => Char

            ; Output: 
            ; A <= Char


            rts

char_to_upper:
            ; Char To Upper
            ; Char is converted to Uppercase

            ; Input:
            ; A => Char

            ; Output:
            ; A <= Char


            rts

is_char:
            ; Is Char
            ; Checks if the Byte given, is a valid char

            ; Input:
            ; A => Char

            ; Output:
            ; A <= 0 if False, 1 if True


            rts