.MODEL tiny, os_dos, nearstack 
 .CODE
 .STARTUP
                
        mov dx,0fd90h
        mov al,0
        out dx,al;
        mov dx,0fd92h
	out dx,al;
        mov dx,0fd94h
	out dx,al;
        mov dx,0fd96h
	out dx,al;

;  グラフィックの表示禁止  
	push ds        
	mov ax,0c000h
	mov ds,ax
	mov ah,00h
	mov bx,0ff83h
	mov [bx],ah

	mov ah,40h
	mov bx,0ff82h
	mov [bx],ah

	mov ah,0fh
	mov bx,0ff81h
	mov [bx],ah

	mov cx,7fffh
	mov bx,0000h
	mov ah,00h
vramclr:
        inc bx
	mov [bx],ah
        loop vramclr
                
        pop ds

 .EXIT 0
	END