// Forum: https://forum.arduino.cc/t/reading-portb-giving-odd-results-using-a-nano/1131576
// This Wokwi project: https://wokwi.com/projects/365868922987712513

// Note: When the crystal is used, the PORTB6 and PORTB7 pins are
//       internally disconnected. 
//       So it is okay to set DDRB for all bits.

void setup() 
{
  Serial.begin(115200);
  DDRB=0;
}

void loop() 
{
  byte x = PINB;
  Serial.print(x);
  Serial.print(",");
  delay(150);
}