long value = 0;

digitalWrite(dataline[0], HIGH);
shiftoutAddress(0xA130F1/2);

Serial.println("START");

// we get 2 bytes at every address
for (unsigned long x=(0x200001/2); x < (0x002003ff/2); x++) {

  shiftoutAddress(x);

  value = readDatalinePins();

  byte byte1 = 0;
  byte byte2 = 0;

  byte1 = (byte) (value >> 8);
  byte2 = (byte) (value & 0xff);

  Serial.println(byte1, DEC);
  Serial.println(byte2, DEC);

  Serial.println("END");


// read data pins
unsigned long readDatalinePins() {
  
  // change to data lines to inputs 
  for (int i = 0; i < 16; i++) {
    pinMode(dataline[i], INPUT);
  }
  
  unsigned long value = 0;
  
  // loop through and read the 16 data lines 
  // write a 0/1 bit at each position in the variable named "value"
  //
  // eg. address line 1 is high (write 1 to bit location 1 on the variable named "value")
  //     address line 5 is low (write 0 to bit location 5 on the variable named "value")
  for (int z = 0; z < 16; z++) {
    if (digitalRead(dataline[z]) == HIGH) { 
        bitWrite(value, z, HIGH);
    }
  }

  return value;
}


// takes a long memory address
// turns on/off (+5v/0v) address line according to memory address
void shiftoutAddress(unsigned long shiftAddress) {

  // change address lines to outputs 
  for (int i = 0; i < 23; i++) {
    pinMode(addressline[i], OUTPUT);
  }
  
  // loop through all 23 addresses
  for (int z = 0; z < 23; z++) {
    
    // read the bit value (0/1) of the supplied shiftAddress
    // enable +5v/0v to the appropriate address pin
    if (bitRead(shiftAddress, z) == HIGH) {
      digitalWrite(addressline[z], HIGH); 
    }
    else {
      digitalWrite(addressline[z], LOW);     
    }
  }  
}