int i; // counter variable -- pgm outputs codes 00000  to 11111 in portB 0-7bits.
// Port B maps to Digital Pins 8 to 13, with two high bits not usable.

void setup()
{
  DDRB = DDRB | B11111111;    // set direction bits for pins 8 to 13,
  //(xx | 00 == xx)  same as pinMode(pin, OUTPUT) for pins 8 to 13
  Serial.begin(9600); 
} 

void loop()
{ 
  for (i=0; i<64; i++) 
  {                             // 6 bits manipulated 0 to 63
   PORTB = PORTB & B00000000 ;  // clear out bits 8 - 13, 
   PORTB = PORTB | i;	 // combine the port information with the new information for LED pins 
   Serial.print("PORTB in BIN=");			 // debug to show masking 
   Serial.print(PORTB, BIN);			 // debug to show masking 
   Serial.print(". i=");		 // debug to show actual decimal number 
   Serial.println(i);		 // debug to show actual decimal number 
   delay(500);
  }
}