byte.asm

该程序为把2字节的4位十六进制数转换为4字节的ASCII码。适合于初学者

;实验1.3
;把2字节的4位十六进制数转换为4字节的ASCII码
DATAS SEGMENT
    ORG 3500H
DATA1 DB 0CAH,27H
ORG 350AH
DATA2 DB 4 DUP(?)   
DATAS ENDS
STACKS SEGMENT
    DW 64 DUP(?)
STACKS ENDS
CODES SEGMENT
    ASSUME CS:CODES,DS:DATAS,SS:STACKS
START:
    MOV AX,DATAS
    MOV DS,AX
    LEA SI,DATA1
    LEA DI,DATA2
    MOV CH,04H
  MOV AX,[SI]
A1: MOV BX,AX
    AND BX,000FH
    ADD BX,30H
    CMP BX,39H
    JG A2
    MOV [DI],BL
    JMP A3
A2: ADD BL,07H
MOV [DI],BL
A3: INC DI
MOV CL,04H
SHR AX,CL
DEC CH
JNZ A1
    INT 03H
CODES ENDS
    END START