a3-2.asm

汇编语言的设计

STACK SEGMENT STACK
	DW 64 DUP(?)
STACK ENDS

DATA SEGMENT
X	DW ?
Y	DW ?
Z	DW ?
DATA	ENDS

CODE SEGMENT
	ASSUME CS:CODE,DS:DATA

START:  MOV AX,DATA
        MOV DS,AX
        MOV AH,00H
	SAHF
	MOV CX,0002H
	MOV SI,OFFSET X
	MOV DI,OFFSET Z
A1:     MOV AL,[SI]
        SBB AL,[SI+02H]
	DAS
	PUSHF
	AND AL,0FH
	POPF
	MOV [DI],AL
	INC DI
	INC SI
	LOOP A1
A2:	JMP A2
CODE 	ENDS
	END START