INT 1A U - DATEFIX - INSTALLATION CHECK                                         
	AX = CCCCh
	BX = CCCCh
	CX = 0000h
Return: CX = CCCCh if installed
	    ES:BX -> original interrupt handler
Program: DATEFIX is a public-domain 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. to correct the date on AT&TAmerican Telephone and Telegraph 6300
	  machines, where the realtime clock's calendar wraps after 1991
SeeAlso: AH=FEh,AH=FFh"AT&TAmerican Telephone and Telegraph"