INT 13,5 - Format Disk Track

	AH = 05
	AL = interleave value (XT only)
	CX = track/cylinder number (see below for format)
	DH = head number  (0-15 dec.)
	DL = drive number (0=A:, 1=2nd floppy, 80h=drive 0, 81h=drive 1)
	ES:BX = pointer to block of "track address fields" containing
		four byte fields for each sector to be formatted of the form:

	       1 byte  track number
	       1 byte  head number	     Size      #
	       1 byte  sector number	     Codes   Bytes
	       1 byte  sector size code        0      128
					       1      256
					       2      512
					       3     1024
	on return:
	AH = status  (see INT 13,STATUS)
	CF = 0 if successful
	   = 1 if error


	- BIOS disk write attempts should reset the controller on error
	- INT 13,17 should be called to set the DASD type
	- this function is capable of doing great damage if the parameters
	  are incorrectly specified; only the drive number is checked
	- initializes disk address fields and data sectors
	- interleave is specified by ordering of track address fields
	- after INT 13 disk format, if the disk is to be used with DOS the
	  DOS data structure must be written
	- only the disk number is checked for validity
	- the parameters in CX change depending on the number of cylinders;
	  the track/cylinder number is a 10 bit value taken from the 2 high
	  order bits of CL and the 8 bits in CH (low order 8 bits of track):

	|F|E|D|C|B|A|9|8|7|6|5-0|  CX (cylinder value 0-1023 dec.)
	 | | | | | | | | | |  `-----  unused
	 | | | | | | | | `---------	high order 2 bits of track/cylinder
	 `------------------------  low order 8 bits of track/cyl number