Get Extended Processor Exception Handler Vector
(Protected Mode)

Returns the address of the client's protected mode handler
for the specified protected mode exception.

Call With:

   AX     = 0210H
   BL     = exception number (00H-1FH)

Returns:

   if function successful
   Carry flag= clear
   CX:(E)DX= selector:offset of exception handler

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

Notes:

o  DPMI 1.0 clients should use this function in preference
   to Int 31H Fn 0202H.
o  The protected mode exceptions are sent to the protected
   mode handler of the current client. (See Appendix A:
   Glossary for definition of primary client.)