7548



7548           1D7C           ....
     Beginning of non-resident portion of DUP; 40 ($28) byte
     parameter buffer.

7588           1DA4           LINE
     80 ($50) byte line buffer.

7668           1DF4           DBUF
     256 ($100) byte data buffer for COPY routines. Copy routines
     work in 125-byte passes, equal to the number of data bytes in
     each sector on the disk. There are 256 bytes because Atari had
     planned a double density drive which has 253 data bytes in each
     sector.

7924           1EF4           ....
     Miscellaneous variable storage area and data buffers.

7951-8278      1F0F-2056      DMENU
     Disk menu screen display data is stored here.

8191           1FFF           ....
     This is the top of the minimum RAM required for operation (8K).
     To use DOS, you must have a minimum of 16K.

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DUP.SYS ROUTINES
Locations 8192 to 32767 ($2000 to $7FFF) are the largest part of the
RAM expansion area; this space is generally for your own use. If you
have DOS.SYS or DUP.SYS loaded in, they also use a portion of this
area to 13062 ($3306) as below:

8309           2075           DOSOS
     Start of the DOS utility monitor, including the utilities called
     when a menu selection function is completed and the display of
     the "SELECT ITEM" message.

8505           2139           DIRLST
     Directory listing.

8649           21C9           DELFIL
     Delete a file.

8990           231E           ....
     Copy a file. This area starts with the copy messages. The copy
     routines themselves begin at PYFIL, 9080 ($2378).

9783           2637           RENFIL
     Rename a disk file routines.

9856           2680           FMTDSK
     Format the entire disk. There is no way to format specific sectors