Writing variables to nonvolitile memory using xdata

Writing variables to nonvolitile memory using xdata

My MCU is ADuC841 it had (working with SDK)

62 kBytes on-chip Flash/EE program memory
4 kBytes on-chip Flash/EE data memory

I want to store variable that i get from the serial port and write them to the EEPROM then turn off, turn on the MCU and read them some how
(print the stored variable to screen = Hyperterminal)
or using interrupt that prints it to screen.

my code is working on the the simulator of keil
i see the memory window but on then target MCU
it doesn't work

My code:

unsigned char xdata large_array[20] _at_ 1500;
unsigned int  xdata timer_tick;

void INT_EX0() interrupt 0
{
    puts(large_array);
}

void main (void)
{
  while(1)
   {
    T3CON = 0x87;     // 4800
    T3FD  = 0x08;
    SCON  = 0x52;

    IT0  = 1;   // Configure interrupt 0 for falling   edge on /INT0 (P3.2)
    EX0  = 1;   // Enable EX0 Interrupt
    EA   = 1;

   puts("\nEnter string :");
   getline(large_array);   // get string from serial port
   puts(large_array); // read from memory and output to serial port
   }
}

the output of the MCU on Hyperterminal is something like all the char in ascii - "abcdefg...!@#$%^&*()..."

WHAT IS THE PROBLEM ??

Thanks in advance !!!

Mayer