四、实验内容与步骤

1、实验内容

录入并调试完成教材P355例9-2，例9-3，和P358例9-5，掌握8086汇编跳转指令的使用。

2、把调试完成后的例9-2，例9-3，例9-5提交。

9-2.ASM

DATA	SEGMENT
X	DW	135AH
Y	DW	294CH
Z	DW	?
DATA	ENDS
CODE	SEGMENT
	ASSUME CS:CODE,DS:DATA
START:
	MOV	AX,DATA
	MOV	DS,AX
	MOV	AX,X
	CMP	AX,Y
	JBE	NEXT
	SUB	AX,Y
NEXT:
	MOV	Z,AX
	MOV	AH,4CH
	INT 21H
CODE	ENDS
	END	START

9-3.ASM

DATA	SEGMENT
X	DW	0F35AH
DATA	ENDS
CODE	SEGMENT
	ASSUME	CS:CODE,DS:DATA
START:
	MOV	AX,DATA
	MOV	DS,AX
	MOV	AX,X
	SHL	AX,1
	JC	SUB1
	MOV	DL,2BH
	JMP	SUB2
SUB1:
	MOV	DL,2DH
SUB2:
	MOV	AH,2
	INT	21H
	MOV	AH,4CH
	INT	21H
CODE	ENDS
END	START

9-5.ASM

DATA	SEGMENT
NUM	DB	5
STRING1	DB	'HELLO WORLD! ',0AH,0DH,'$'
STRING2	DB	'I LOVE THIS GAME',0AH,0DH,'$'
STRING3	DB	'COMPUTER SIENCE',0AH,0DH,'$'
STRING4	DB	'ASSEMBLE LANGUAGE',0AH,0DH,'$'
STRING5	DB	'COMPUTER ORGANIZATION',0AH,0DH,'$'
DATA	ENDS
STACK1		SEGMENT	PARA	STACK
	DW	20H DUP(0)
STACK1	ENDS
CODE	SEGMENT
	ASSUME	CS:CODE,DS:DATA
START:
	MOV	AX,DATA
	MOV	DS,AX
	MOV	AL,NUM
	CMP	AL,1
	JZ	FLAG1
	CMP	AL,2
	JZ	FLAG2
	CMP	AL,3
	JZ	FLAG3
	CMP	AL,4
	JZ	FLAG4
	CMP	AL,5
	JZ	FLAG5
FLAG1:
	MOV	DX,OFFSET	STRING1
	JMP	SHOW
FLAG2:
	MOV	DX,OFFSET	STRING2
	JMP	SHOW
FLAG3:
	MOV	DX,OFFSET	STRING3
	JMP	SHOW
FLAG4:
	MOV	DX,OFFSET	STRING4
	JMP	SHOW
FLAG5:
	MOV	DX,OFFSET	STRING5
	JMP	SHOW
SHOW:
	MOV	AH,09H
	INT 21H
	MOV	AH,4CH
	INT	21H
CODE	ENDS
END	START