assume cs:code data segment db 'welcome to masm!' db 2,36,113 data ends code segment start: mov ax,data mov ds,ax mov bx,0 mov di,16 mov ax,0b800h mov es,ax mov si,16012+352 mov cx,3 s: mov ah,ds:[di] push cx mov cx,16 s1: mov al,ds:[bx] mov es:[si],ax add si,2 inc bx loop s1 pop cx add si,128 inc di mov bx,0 loop s mov ax,4c00h int 21h code ends end start改成子程序

好的，将代码改写成子程序如下：

assume cs:code
data segment
	db 'welcome to masm!'
	db 2,36,113
data ends

code segment
start:
	mov ax, data
	mov ds, ax
	call displayMessage
	mov ax, 4c00h
	int 21h

displayMessage:
	push bx
	push di
	push si
	mov bx, 0
	mov di, 16
	mov ax, 0b800h
	mov es, ax
	mov si, 16012+352
	mov cx, 3

s:
	mov ah, ds:[di]
	push cx
	mov cx, 16

s1:
	mov al, ds:[bx]
	mov es:[si], ax
	add si, 2
	inc bx
	loop s1

	pop cx
	add si, 128
	inc di
	mov bx, 0
	loop s

	pop si
	pop di
	pop bx
	ret

code ends
end start