二进制到十六进制转换程序

最新推荐文章于 2022-01-03 12:51:03 发布

转载最新推荐文章于 2022-01-03 12:51:03 发布 · 601 阅读

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CODE   SEGMENT
MAIN  PROC FAR
ASSUME CS: CODE
START:
; SET UP STACK FOR RET
   PUSH DS      ; save old data segment
   SUB  AX, AX     ; put zero in AX and save it on stack
   PUSH AX
; MAIN PART OF PROGRAM
   MOV CH, 4     ; number of digits
ROTATE:  MOV CL, 4     ; set count to 4 bits
   ROL  BX, CL
   MOV AL, BL
   AND  AL, 0FH     ; mask off left digit
   AND AL, 30H     ; convert hex to ASCII
   CMP AL, 3AH     ; is it greater than 9 ?
   JL  PRINT
   ADD  AL, 7H
PRINT:  MOV DL, AL     ; put ASCII char in DL
   MOV AH, 2     ; display output function
   INT 21H      ; CALL DOS
   DEC  CH      ; done 4 digits ?
   JNZ  ROTATE
   RET
MAIN  ENDP
CODE  ENDS
   END
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