汇编基础学习

assume cs:code,ds:data

data segment
		db 'welcome to masm!'
		db 02h,24h,71h
data ends

stack segment stack
		dw 8 dup(0)
stack ends

code segment
		start:
		mov ax,data
		mov ds,ax
		mov ax,stack
		mov ss,ax
		mov sp,10h
		
		xor bx,bx
		mov ax,0b872h
		
		mov cx,3
		s3:
		push cx
		push ax
		push bx
		
		mov es,ax
		
		mov si,0
		mov di,0
		
		mov cx,10h 
		s1:
		mov al,ds:[si]
		mov es:[di],al
		inc si
		add di,2
		loop s1
		
		mov di,1
		pop bx
		mov al,ds:10h[bx]
		inc bx
		
		mov cx,10h
		s2:
		mov es:[di],al
		add di,2
		loop s2
		
		pop ax
		add ax,0ah
		
		pop cx
		loop s3
	
		mov ax,4c00h
		int 21h
		
code ends

end start

assume cs:code,ds:data

data segment
		db 'word',0
		db 'unix',0
		db 'wind',0
		db 'good',0
data ends
stack segment stack
	db 15 dup(0)
stack ends

code segment
		
start:
		mov ax,data
		mov ds,ax
		mov cx,4
		mov si,0
s:
		push cx
		call capital
		pop cx
		inc si
		loop s	
		mov ax,4c00h
		int 21h	
capital:
		mov cl,[si]
		mov ch,0
		jcxz ok
		and byte ptr [si],11011111b
		inc si
		jmp short capital
ok:
		ret
code ends

end start