Compatibility: DPMI 0.9+
Expects: AX    0203H
BL    exception number (00h-ffH)
CX:DX (or CX:EDX) selector:offset of exception handler
Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
Info: Sets the vector for the code to be executed during a CPU

Note: When using a DPMI 1.0 host, use INT 31H 0212H and INT 31H 0213H
rather than this 0.9-spec fn.

See Also: DPMI API
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INT 31H 0203H: Set Processor Exception Handler Vector