INT 13,8 - Get Current Drive Parameters (XT & newer)


	AH = 08
	DL = drive number (0=A:, 1=2nd floppy, 80h=drive 0, 81h=drive 1)


	on return:
	AH = status  (see INT 13,STATUS)
	BL = CMOS drive type
	     01 - 5  360K	     03 - 3  720K
	     02 - 5  1.2Mb	     04 - 3 1.44Mb
	CH = cylinders (0-1023 dec. see below)
	CL = sectors per track	(see below)
	DH = number of sides (0 based)
	DL = number of drives attached
	ES:DI = pointer to 11 byte Disk Base Table (DBT)
	CF = 0 if successful
	   = 1 if error


	Cylinder and Sectors Per Track Format

	|F|E|D|C|B|A|9|8|7|6|5|4|3|2|1|0|  CX
	 | | | | | | | | | | `------------  sectors per track
	 | | | | | | | | `------------	high order 2 bits of cylinder count
	 `------------------------  low order 8 bits of cylinder count

	- 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)
	- many good programming references indicate this function is only
	  available on the AT, PS/2 and later systems, but all hard disk
	  systems since the XT have this function available
	- only the disk number is checked for validity