ATTiny84 D0 pin? (Physical pin 2) Am I missing something?

Projects Programming
1

I do not know if this is a hardware OR a software problem...but I am assuming software.

I have made myself a rubbish (but it works) Nano Attiny84 ISP baord to program some ATTiny84s (much like the one I made for tiny85s).

My problem is I have successfully uploaded my first sketch and it works! Well...sort of. I borrowed the blink code and tried pin 0 as the led first. No such luck. Pin 2 of the chip is meant to be D0.

So I wondered if it was just that pin, so modified the code to the code below (tests all pins with a 100ms blink).

They all work, pins D1-D10 all work. Why does D0 not work? Do I need to do something with fuses?

I have tried a second chip in case it was just fried, and still no luck. Same symptoms.

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin 13 as an output.
  for (int i=0; i<10;i++){
  pinMode(i, OUTPUT);
  }
}

// the loop function runs over and over again forever
void loop() {
  
  for (int i=0; i<10;i++){
  digitalWrite(i, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(100);              // wait for a second
  digitalWrite(i, LOW);    // turn the LED off by making the voltage LOW
  delay(100);             
  } // wait for a second
}
2

Ok,

It seems I was missing something...a bit of a noob mistake.

Changed the sketch again so each pin flashes it's number (+an extra flash I think?):

void setup() {

  for (int i = 0; i < 10; i++) {
    pinMode(i, OUTPUT);
  }
}


void loop() {
  int x = 0;
  for (int i = 0; i < 10; i++) {
    while ( x <= i) {
      digitalWrite(i, HIGH);   
      delay(200);              
      digitalWrite(i, LOW);    
      delay(200);
      x++;
    }
    x = 0;
  }
}

So I searched google again...and it seems as though on all of the available google images, I picked an incorrect datasheet (ha!). Someone shoot me.