I think I know what's going on here. I'm using a different set of Board definitions. Of course that could be mapping the phyiscal ports differently.
No, I don't think the missing jumper is the cause. I routinely use LED's with a current limiting resistor already soldered on. I did find another site with instructions that has a pinout diagram that matches what I'm seeing: ATtiny44-84.png
Hi, thanks for this tutorial. It works now. I had some trouble getting it to work, though. Physical pin 2 on the ATTINY84 does not map to pin0 in the code. Instead, I had to use pin10 in the code as in: digitalWrite(10, HIGH); to make the LED on physical pin 2 blink. I've been pulling out my hair wondering why the LED wasn't blinking.Thankfully, the sketch to make all LEDs blink did the trick. Did I miss something?