Having issues with using all the digital port pins

Hey Guys and Gals,

Having an issue using all the digital pins wondering what could be wrong???

this code is toggling every pin supposedly and the a0-a5 is working but the 0-13 stuff isn't on some of the pins

// testing each output with a scope

void setup()
{
pinMode(0,OUTPUT);
pinMode(1,OUTPUT);
pinMode(2,OUTPUT);
pinMode(3,OUTPUT);
pinMode(4,OUTPUT);
pinMode(5,OUTPUT);
pinMode(6,OUTPUT);
pinMode(7,OUTPUT);
pinMode(8,OUTPUT);
pinMode(9,OUTPUT);
pinMode(10,OUTPUT);
pinMode(11,OUTPUT);
pinMode(12,OUTPUT);
pinMode(13,OUTPUT);
pinMode(A0,OUTPUT);
pinMode(A1,OUTPUT);
pinMode(A2,OUTPUT);
pinMode(A3,OUTPUT);
pinMode(A4,OUTPUT);
pinMode(A5,OUTPUT);
}

void loop()
{
// turn ever pin high-----------------------------------------------
digitalWrite(0, HIGH);  
digitalWrite(1, HIGH); 
digitalWrite(2, HIGH);  
digitalWrite(3, HIGH);  
digitalWrite(4, HIGH); 
digitalWrite(5, HIGH);   
digitalWrite(6, HIGH); 
digitalWrite(7, HIGH);   
digitalWrite(8, HIGH); 
digitalWrite(9, HIGH);   
digitalWrite(10, HIGH); 
digitalWrite(11, HIGH);  
digitalWrite(12, HIGH);  
digitalWrite(13, HIGH); 
digitalWrite(A0, HIGH);  
digitalWrite(A1, HIGH); 
digitalWrite(A2, HIGH);
digitalWrite(A3, HIGH);
digitalWrite(A4, HIGH);
digitalWrite(A5, HIGH);
delay(10);               // wait for a bit
// turn ever pin low-----------------------------------------------
digitalWrite(0, LOW);  
digitalWrite(1, LOW); 
digitalWrite(2, LOW);  
digitalWrite(3, LOW);  
digitalWrite(4, LOW); 
digitalWrite(5, LOW);   
digitalWrite(6, LOW); 
digitalWrite(7, LOW);   
digitalWrite(8, LOW); 
digitalWrite(9, LOW);   
digitalWrite(10, LOW); 
digitalWrite(11, LOW);  
digitalWrite(12, LOW);  
digitalWrite(13, LOW); 
digitalWrite(A0, LOW);  
digitalWrite(A1, LOW); 
digitalWrite(A2, LOW);
digitalWrite(A3, LOW);
digitalWrite(A4, LOW);
digitalWrite(A5, LOW); 
delay(10);// wait for a bit

}