Reads a byte from the EEPROM. Locations that have never been written to have the value of 255.
EEPROM.read(address)address: the location to read from, starting from 0 (int)
the value stored in that location (byte)
#include <EEPROM.h>
int a = 0;
int value;
void setup()
{
  Serial.begin(9600);
}
void loop()
{
  value = EEPROM.read(a);
  Serial.print(a);
  Serial.print("\t");
  Serial.print(value);
  Serial.println();
  a = a + 1;
  if (a == 512)
    a = 0;
  delay(500);
}