Function 1Bh Get Current Drive File Allocation Table Information
Returns information from the FAT on the current drive
entry AH 1Bh
exit AL number of sectors per allocation unit (cluster)
DS:BX address of the current drive's media descriptor byte
CX number of bytes per sector
DX number of allocation units (clusters) for default drive
note 1) Save DS before calling this function.
2) This call returned a pointer to the FAT in DOS 1.x. Beginning with
DOS 2.00, it returns a pointer only to the table's ID byte.
3) IBM recommends programmers avoid this call and use int 25h instead.
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