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INT 31 - DPMI 0.9 API - protected mode - SET REAL MODE INTERRUPT VECTOR
        AX = 0201h
        BL = interrupt number
        CX:DX = segment:offset of real mode handler
Return: CF set on error
        CF clear if successful
Note:   all memory that may be touched by a hardware interrupt handler must be
          locked down with INT 31/AX=0600h
SeeAlso: AX=0200h,AX=0205h,AX=0600h