>         mov old_lite,al         ; Set flag.
 > ;        mov ax,1000h            ; Turn video on.
 > ;        mov bx,0F12h
 > ;        int 10h
 > ;        jmp exit
 I understand the code before. But why you commented out these instructions.
 I really want to make of use of int in the handler. i guess you got problem
 too :-)
 Anyone out there can share ideas?
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