a2-4.asm

汇编语言的设计

STACK SEGMENT STACK
	DW 64 DUP(?)
STACK ENDS

CODE SEGMENT
	ASSUME CS:CODE

START:	MOV CX,0004H
	MOV DI,3500H
	MOV DX,[DI]	
A1:	MOV AX,DX
	AND AX,000FH
	CMP AL,0AH
	JB A2
	ADD AL,07H
A2:	ADD AL,30H
	MOV [DI+0AH],AL
	INC DI
	PUSH CX
	MOV CL,04H
	SHR DX,CL
	POP CX
	LOOP A1
A3:	JMP A3	
CODE ENDS
     END START