- SUB BH, BH\r
- MOV BL, c ; the letter\r
- SHL BX, 1\r
- SHL BX, 1\r
- SHL BX, 1\r
- SHL BX, 1\r
- ADD SI, BX ;the address of A\r
- MOV CX, 16\r
+ SUB AH, AH\r
+ MOV AL, c ; the letter\r
+ MOV CX, w\r
+ MUL CX\r
+ ADD SI, AX ;the address of charcter\r