汇编语言（王爽）实验10 初版

assume cs:code
data segment
    db 'Welcome to masm!',0
data ends

code segment
start:  mov dh,8
        mov dl,3
        mov cl,2
        mov ax,data
        mov ds,ax
        mov si,0
        call show_str

        mov ax,4c00h
        int 21h
show_str:
        mov ax,0b800h
        mov es,ax
        mov di,160*8+2*3
        mov dl,cl
change: 
        mov ch,0
        mov cl,[si]
        jcxz ok
        mov al,[si]
        mov ah,dl
        mov es:[di],ax
        inc si
        add di,2
        jmp short change
ok:     ret

code ends
end start