Function 01h    Set Clock - set # of 55ms clock ticks in system time counter
entry   AH      01h 
	CX:DX   high word/low word count of timer ticks  
return  none 
note 1) The clock ticks are incremented by timer interrupt at 18.2065 times  
	per second or 54.9254milliseconds/count. Therefore:  
		counts per second = 18      (12h) 
		counts per minute = 1092    (444h) 
		counts per hour   = 65543   (10011h) 
		counts per day    = 1573040 (1800B0h) 
     2) Through an incredible coincidence, the low word rolls over into the
	high word once every 3599.54 seconds which is allmost exactly once an
	hour (3600 seconds). So the high word is the number of hours and the
	low word is the number of minutes * 1092 or seconds * 18.2.
     3) counter is zeroed when system is rebooted