INT 2F R - Phar Lap 386/DOS-Extender v4.1 - GET EXTENDER ENTRY POINT            
	AX = ED03h
	CX = real-mode code segment
	DX = real-mode data segment
Return: CF clear if successful
	    CX = protected-mode code segment selector
	    DX = protected-mode data segment selector
	    ES:DI -> real-mode entry point for calling protected-mode functions
		      (see INT 21/AX=250Dh)
	CF set on error
	    AX = error code
		0008h unable to allocate LDT descriptors