memcopy.c

#include <reg52.h>

unsigned char xdata loc1 _at_ 0x1000;
unsigned char xdata loc2 _at_ 0x2000;

unsigned char xdata *ptr1;
unsigned char xdata *ptr2;

int main()
{
  int i = 0;
  ptr1 = &loc1;
  ptr2 = &loc2;

  for (i = 0; i < 1000; i++)
  {
    *ptr2 = *ptr1;
    ptr1++;
    ptr2++;
  }
}