*** IMPORTANT NOTE ***
    Far Memory Support is only available in the PK51 package.
    If you have an CA51, DK51, or Evaluation Package the far memory
    support is not available and this example will not work.


The following example program shows you how to use the new features
of C51 Version 6.23 and LX51 Linker/Locater Version 3.23 to access
up to 4MB xdata and code space on classic 8051 devices.

In this example we are using 7 memory banks for xdata and 7 memory
banks for code.  Refer to the "Macro Assembler and Utilities" User's
Guide, "Chapter 9. Linker/Locater - Bank Switching - Configuration
Examples: Banking with Common Area" for a hardware schematic that
matches to this tool configuration.

C51 provides you with the 'far' memory type that can be used to
access large memory.  The memory accesses routines are part of the
L51_BANK.A51 configuration file.  The example includes a configured
version of the L51_BANK.A51 file.

You may use the 'far' memory banking together with code banking 
to expand the program code memory. 

The 'far' memory type is handled at LX51 linker/locater level with 
new memory classes:
    HDATA   memory class for the 'banked' xdata memory.
    HCONST  memory class for the 'banked' code memory.

To configure the LX51 Linker/Locater you the following options
under Options for Target - LX51 Locate:

Disable: Use Memory Layout from Target Dialog.

Enter under User Classes:
XDATA (X:0x0-X:0x7FFF), CODE (C:0x0-C:0x7FFF), 
HDATA (X:0x028000-X:0x02FFFF, X:0x038000-X:0x03FFFF, X:0x048000-X:0x04FFFF,X:0x058000-X:0x05FFFF, 
                  X:0x068000-X:0x06FFFF, X:0x078000-X:0x07FFFF, X:0x088000-X:0x08FFFF) ,
HCONST (B1:0x8000-B1:0xFFFF, B2:0x8000-B2:0xFFFF, B3:0x8000-B3:0xFFFF,B4:0x8000-B4:0xFFFF,
                     B5:0x8000-B5:0xFFFF, B6:0x8000-B6:0xFFFF, B7:0x8000-B7:0xFF