///1FAT

  Syntax:

          FAT DIR    <path>
          FAT COPY   <src> <dst>
          FAT REN    <from> <to>
          FAT DEL    <path>[<file>|<dir>]
          FAT MD     <path>
          FAT FORMAT <drv>

       CP/M filespec: <d>:FILENAME.EXT (<d> is CP/M drive letter)
       FAT filespec:  <u>:/DIR/FILENAME.EXT (<u> is device #)

  Explanation:

       FAT  is used to  manipulate and  exchange files  with a  FAT
       (DOS) filesystem. It runs on any HBIOS hosted CP/M implemen-
       tation.

       The first parameter defines the action to perform on the FAT
       filesystem.

  Author:

       Wayne Warthen (wwarthen@gmail.com)

  ///2Examples

  A>FAT DIR 2:/

       Shows the root directory of device 2

  A>FAT COPY C:TEXT.TXT 2:/BOOK/

       Copy the file TEXT.TXT from CP/M drive C:  to the directory
       /BOOK on device 2.

  A>FAT COPY 2:/BOOK/TEXT.TXT C:

       Vice versa

  A>FAT REN
  A>FAT DEL
  A>FAT MD
  A>FAT FORMAT
       (not yet finished)

  ///3Notes

       Partitioned or non-partitioned media is handled automatical-
       ly.   A floppy drive is a good example of a  non-partitioned 
       FAT filesystem  and will be  recognized.  Larger media  will 
       typically have a partition table which will be recognized by
       the application to find the FAT filesystem.
   
       Although  RomWBW-style  CP/M  media does not  know  anything 
       about  partition tables,   it is entirely  possible  to have 
       media that  has both CP/M and FAT  file systems on it.  This 
       is  accomplished by  creating a  FAT filesystem on the media 
       that starts  on a track  beyond the last track used by CP/M.  
       Each  CP/M slice on  a media will occupy  a little over 8MB. 
       So, make sure to start your FAT partition beyond 
         (slice count) * 8MB.

       The application infers whether  you are attempting to refer-
       ence a FAT or CP/M filesystem via the drive specifier  (char
       before ':').
       A numeric drive character specifies the HBIOS disk unit num-
       ber for FAT access.  An alpha  (A-P)  character indicates  a 
       CP/M  file system access targeting  the specified drive let-
       ter.  If there  is no drive character specified, the current
       CP/M filesystem and current CP/M drive is assumed.  
       For example:
   
       2:README.TXT refers to FAT file README.TXT on disk unit #2
       C:README.TXT refers to CP/M file README.TXT on CP/M drive C
       README.TXT   refers to README.TXT on current CP/M drive
   
       Files with SYS, HIDDEN, or R/O only attributes are not given
       any  special treatment.  Such files are  found and processed
       like any  other file.  However,  any attempt to  write  to a
       read-only file will fail and the application will abort.
 
       It  is not currently  possible to reference  CP/M user areas 
       other than the current user. To copy files to alternate user 
       areas,  you must switch to the  desired user number first or 
       use an additional step to copy the file to the desired  user
       area.
   
       Accessing  FAT filesystems  on a floppy requires  the use of
       RomWBW HBIOS v2.9.1-pre.13 or greater.
   
       Files written are not verified.
 
       Wildcard matching in FAT filesystems is a bit unusual as im-
       plemented by FatFs.  See FatFs documentation.