H_B PROC FAR
MOV DX,3E8H
SUB AX,AX
MOV CX,16
LP: ADD DX,DX
ADC AL,AL
DAA
XCHG AH,AL
ADC AL,AL
DAA
XCHG AH,AL
LOOP LP
RET
H_B ENDP
说明程序功能，AX=？