单词记忆测试器程序设计(5)

微机原理

CMP BX,0

JZ OVER

U2: MOV DL,[BX+1]

MOV AH,02H

INT 21H

INC BX

CMP DL,20H

JZ U3

JMP U2

U3: ADD DI,02H

JMP U1

OVER: JMP OVER

MOV AX,4C00H INT 21H

ZH PROC

PUSH CX

MOV AL,00H

ADD AL,BL

DAA

MOV BL,AL

H: AND AL,0F0H

CMP AL,00H

JZ L

MOV CL,04H

SHR AL,CL

ADD AL,30H

MOV DL,AL

MOV AH,02H

INT 21H

L: MOV AL,BL

AND AL,0FH

ADD AL,30H

MOV DL,AL

MOV AH,02H

INT 21H

POP CX

RET

ZH ENDP

CLEAR PROC PUSH CX

PUSH DX ;调用dos中断，返回系统;子程序清屏