Hola Ken!
 RV>> antig=getvect(9);     // I save the old handler vector
 RV>> setvect(9,(*antig)(...));          // I restore the old handler
 RV>> //(*antig)(...);   ********This is the problem*********
 KW> Possibly ?
 KW>   setvect(9,antig);          // I restore the old handler
   Thank you for answering, but I think that is not the problem because it 
occurs when the new handler is on (anyway I have to check if I restore the 
handler correctly).
    I think the problem is on how C++ returns from a function when it uses 
the reserved word 'interrupt', Does it use RTI? Does it restore the interrupt 
mask?
How can I make it manually?
Un saludo
     Rafa
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