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====== Int 31H, AH=02H, AL=13H ======

===== Version =====

1.0

===== Brief =====

Set Extended Processor Exception Handler Vector (Real Mode)

===== Input =====

  AX = 0213H
  BL = exception/fault number (00H-1FH)
  CX:(E)DX = selector:offset of exception handler
        
===== Return =====

  if function successful
  Carry flag = clear
  
  if function unsuccessful
  Carry flag = set
  AX = error code
  8021H	invalid value (BL not in range 00H-1FH)
  8022H	invalid selector

===== Notes =====

CX:(E)DX does not specify a real-mode segment:offset. The reason is that this function allows a client to set the address of an exception handler which will receive control in protected mode when the specified exception occurs in real mode (i.e. the host will provide an implied mode switch for the purposes of servicing the exception, then return to real mode after the handler exits).

Real mode exceptions are sent to the primary client of the virtual machine. (See Appendix A: Glossary for definition of primary client.)

Refer to the rules for descriptor usage in Appendix D. 
        
===== See also =====

   

===== Note =====

Text based on [[http://www.delorie.com/djgpp/doc/dpmi/]]

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