.CODE
start:
        push  offset ExceptCallBack&#59; (security if ring transform doesn’t work)
 call   SetUnhandledExceptionFilter &#59; Catch exceptions 
        call ShowBuffer
 push offset Ring0Code      
 call ToRing0Code      
 invoke ExitProcess,0   &#59; exit

Ring0Code PROC    &#59; Ring0 code here..

 mov dx,1f6h  &#59;Drive and head port
        mov al,0a0h  &#59;Drive 0,Head 0
        out dx,al

        mov dx,1f2h  &#59;Sector count port
        mov al,1     &#59;Read One Sector
        out dx,al

        mov dx,1f3h  &#59;Sector number port
        mov al,1     &#59;Read One Sector
        out dx,al

        mov dx,1f4h  &#59;Cylinder low port
        xor al,al    &#59;Cylinder 0
        out dx,al

        mov dx,1f5h  &#59;Cylinder high port
        xor al,al    &#59;The rest of Cylinder 0
        out dx,al
 
        mov dx,1f7h  &#59;Command port
        mov al,20h   &#59;Read with Entry
        out dx,al
Still_going:
        in al,dx
        test al,8   &#59;This means the sector buffer requires servcing
        jz Still_going&#59;do not continue until the sector buffer is ready
        xor ecx,ecx
 mov cx,512/2  &#59;one sector/2
        mov edi,offset buffer2
        mov dx,1f0h   &#59;data port - data comes in and out here
        cli
        cld
        rep insw
        sti

   xor ecx,ecx
   mov cx,352/2