INT 21 P - Phar Lap 386/DOS-Extender - SET EXCEPTION HANDLER VECTOR             
	AX = 2533h
	CL = exception number (00h-0Fh)
	DS:EDX = CS:EIP of new exception handler
Return: CF clear if successful
	CF set on error (CL > 0Fh)
Notes:	this call is also supported by the FlashTek X-32VM extender
	this function is incompatible with 386|VMM; use AX=2522h instead
SeeAlso: AX=2522h,AX=2532h