.model tiny
.code
org 100h
start:
mov ax, 3
int 10h
cld
mov ax, 0B800h
mov es, ax
xor di, di
mov cx, 280h
mov ax, 0FDBh
repe stosw
mov ax, 1DBh
mov cx, 280h
repe stosw
mov ax, 0CDBh
mov cx, 280h
repe stosw
ret
end start