hextobin.asm

来自「fx.asm 反序输出 cpc.asm 人机对话 DECHEX.ASM 」· 汇编 代码 · 共 33 行

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