1536-1791



---------------------------------------------------------------------------
1536-1791      600-6FF        ....
     Page six: 256 ($FF) bytes protected from OS use. Page six is not
     used by the OS and may be safely used for machine language
     subroutines, special I/O handlers, altered character sets, or
     whatever the user can fit into the space. Some problem may arise
     when the INPUT statement retrieves more than 128 characters.
     The locations from 1536 to 1663 ($600 to $67F) are then
     immediately used as a buffer for the excess characters. To avoid
     overflow, keep INPUT statements from retrieving more than 128
     characters. The valFORTH implementation of fig-FORTH (from
     ValPar International) uses all of page six for its boot code, so it is
     not available for your use. However, FORTH allows you to
     reserve other blocks of memory for similar functions. BASIC A+
     uses locations $0600 - $67F.

---------------------------------------------------------------------------
     Locations 1792 to the address specified by LOMEM (locations
     128, 129; ($80, $81) - the pointer to BASIC low memory) are also
     used by DOS and the File Management System (FMS). Refer to
     the DOS source code and Inside Atari DOS for details. The
     addresses which follow are those for DOS 2.0S, the official Atari
     DOS at the time of this writing. Another DOS is available as an
     alternative to DOS 2.0 -- K-DOS (TM), from K-BYTE (R). K-DOS
     is not menu driven but command driven. It does not use all of the
     same memory locations as the Atari DOS although it does use a
     modified version of the Atari FMS. (Another command-driven
     DOS, called OS/A+, is completely compatible with DOS 2.OS
     and is available from OSS, the creators of DOS 2.0S.)

1792-5377      700-1501
     File management system RAM (pages seven to fifteen). FMS
     provides the interface between BASIC or DUP and the disk
     drive. It is a sophisticated device driver for all I/O operations
     involving the D: device. It allows disk users to use the special
     BASIC XIO disk commands (see the IOCB area 832 to 959: $340
     to $3BF). It is resident in RAM below your BASIC RAM and
     provides the entry point to DOS when called by BASIC.

5440-13062     1540-3306
     DUP.SYS RAM. The top will vary with the amount of buffer
     storage space allocated to the drive and sector buffers.

6780-7547      1A7C-1D7B
     Drive buffers and sector-data buffers. The amount of memory will
     vary with the number of buffers allocated.

7548-MEMLO     1D7C-3306 (maximum)