hextobin.asm

fx.asm 反序输出 cpc.asm 人机对话 DECHEX.ASM 十进制到十六进制转换 PX.ASN 排序 DISP.ASM 显示非组合BCD码 COUNTA.ASM 统计字符A

TITLE   HEXTOBIN
        PUBLIC HEXTOBIN
;---------------------------------------        
CODE    SEGMENT PARA 'CODE'
        ASSUME CS:CODE
;---------------------------------------
HEXTOBIN  PROC FAR
        MOV BX,0
LP:     INC SI
        MOV AL,[SI]
        SUB AL,30H
        JL EXIT
        CMP AL,10
        JL ADD_TO

        SUB AL,27H
        CMP AL,0AH
        JL EXIT
        CMP AL,10H
        JGE EXIT
ADD_TO: MOV CL,4
        SHL BX,CL
        MOV AH,0
        ADD BX,AX
        JMP LP

EXIT:   RET
HEXTOBIN  ENDP
;--------------------------------------
CODE    ENDS
        END