Function 09h	Initialize Two Fixed Disk Base Tables	 (XT, AT, XT/286, PS/2)
		(install nonstandard drive) 
entry   AH      09h 
return  CF      set on error 
		AH      status code (see above) 
		data block definitions: 
		+0   maximum number of cylinders	      dw
		+2   maximum number of heads		      db
		+3   starting reduced write current cylinder  dw (XT only)
		+5   starting write precomp cylinder	      dw
		+7   maximum ECC data burst length	      db (XT only)
		+8   control byte: Bits   
		     0,1,2 - drive option
		     3,4,5 - always zero 
			 6 - disable ECC retries 
			 7 - disable access retries 
note 1) Int\41 points to table for drive 0  (XT, AT)
     2) Int\46 points to table for drive 1  (AT)