v 1.4	Maintenance release: bug fixed
	- With certain combinations of head-, sector-, startsector-
	  and endsector numbers the output conversion routine
	  produces an overflow error during driver initialization,
	  resulting in system hangup during the boot phase.

v 1.3	Maintenance release: options added, bugs fixed,
	                     internal functionality changed
	- /STARTSEC option added, setting the start sector on
	  the first cylinder defined with /STARTCYL to something
	  other than 1.
	- /ENDSEC option added, setting the last sector on the
	  last cylinder defined with /ENDCYL to something other
	  than HEADS*SECTORS.
	- bug fixed in the computation of the number of FAT sectors
	  needed. If the last cluster number falls exactly on the
	  last word of the last FAT sector one additional FAT sector
	  was generated, causing discrepancies with what DOS expects.
	  This should have happened rarely with previous versions,
	  but is more likely now with the ability to set start and
	  end sectors.
	- the FAT contents generation algorithm has been changed.
	  It is now independent of any kind of directory entry
	  (delete marker, zero length file size entries) which
	  caused lots of subtle troubles with previous versions.
	  Although these troubles were not dangerous for disk
	  contents, RAWDISK generated wrong FAT contents when a file
	  entry was deleted in the directory prior to deleting the
	  last FAT sector. The new algorithm should be much more stable,
	  although it might not be bullet-proof under all possible
	  circumstances.
	- the write-with-verify driver function was added to allow
	  either usage of the /V option of several DOS commands or
	  set VERIFY ON permanently.
	- the driver no longer contains any debug error messages.
	  If INT 13h reports any error after a read or write
	  operation, a read- or write-fault driver error code is
	  produced. This most often happens, when a disk parameter
	  (cylinder, head, sector) is defined above its limits for
	  this particular disk.

v 1.2	internal test release (not published): 1 new option added
	- a new option /EXTCYL (/XC) is added supporting extended
	  cylinder addressing on some BIOS versions. This option
	  enables 2 more bits for the cylinder number, resulting 
	  in a maximum of 4096 cylinders (maximum 2 GB).

v 1.1	Bugfix version: 2 bugs fixed
	- modified/additional entries for virtual bootsector to
	  prevent DR-DOS CHKDSK thinking RAWDISK.DRV is an
	  illegal drive.
	- bug fixed, that prevents writing to RAWDISK.DRV, if a
	  new directory entry is written first before the FAT is
	  being read to get the available bytes on the drive.
	  This results immediately in a disk full error, thereby
	  preventing successful restore operation.

v 1.0	Initial release of RAWDISK.SYS

Juergen Prang	(jprang@uni-duisburg.de)
