Mike, what is so perfect about it? What happens if you need to re-arrange to i/o pins to suit the circuit board? What happens if certain pins are used for different functions? Whilst it's nice to have the pins sequential, real world constraints to put paid to such niceties. I recently posted some code where I had a less than perfect pin arrangement. These were the pins I had left after the others were allocated. Just have the code hide the evil.