> I am not so clued up on the 'base 2' and 'base 8' stuff. > Care to explain that a little? Easy. Imagine the numerals 2,3,4,5,6,7,8,9 were never invented. You'd start counting at 0. Next would come 1. Now you've maxed out your first column so you have to carry to the next column, so next would come 10. Alan