void setup() {
  Serial.begin(115200);

  // // initializing output pins
  // for(int i=0; i<34; i++){
  //   pinMode(i, OUTPUT);
  // }

  pinMode(53, OUTPUT);
  pinMode(52, OUTPUT);
  pinMode(51, OUTPUT);
  pinMode(50, OUTPUT);

// // initializing address pins
//   for(int i=34; i<54; i++){
//     pinMode(i, INPUT);
//   }

  pinMode(40, INPUT);
  pinMode(41, INPUT);
  pinMode(42, INPUT);
  pinMode(43, INPUT);

  //setting pc inputs to 0000
  digitalWrite(40, LOW);
  digitalWrite(41, LOW);
  digitalWrite(42, LOW);
  digitalWrite(43, LOW);

  digitalWrite(A0, HIGH);
  digitalWrite(40, LOW);
  digitalWrite(41, LOW);
  digitalWrite(42, LOW);
  digitalWrite(43, LOW);

  delay(50);
  digitalWrite(A2, LOW);
  delay(50);
  digitalWrite(A2, HIGH);
  digitalWrite(A0, LOW);
  digitalWrite(A0, HIGH);

}

void loop() {
  // put your main code here, to run repeatedly:
}

/*
Program Counter:
A0: enable pin
D0, D1, D2, D3: 40, 41, 42, 43
Q0, Q1, Q2, Q3: 53, 52, 51, 50
LOAD: A1
CLOCK: A2
*/