INT 2F U - Smart Prompt - INSTALLATION CHECK                                    
	AX = C64Ch
	BX = 5553h
Return: AX = 4CC6h if installed
	BX = 5355h if installed
Program: Smart Prompt (SMARTPMT) is a freeware TSR(Terminate and Stay Resident) A program which remains in memory after terminating in order to provide services to other programs or the user.  The name comes from the name of the DOS function call used to remain in memory after termination. by Steve Gibson which
	  forces an immediate flush of SmartDrive's (and compatible caches')
	  buffers on returning to the DOS prompt