Binary

So why 3 digits with a leading zero? Old habits die hard. I date back to the days where binary commands were entered into a computer console via toggle switches. The printout of the binary command sequences were always written in Octal (only using the numbers 0-7). And the console switches were arranged in groups of 3. So, if the command was an Octal 2 (Octal 2 is 010.), the computer operator would look at the first group of 3 switches, the switch farthest to the left on that group of 3 would be down along with the switch farthest to the right. And the middle switch would be up. After the switches were in place, the deposit key would place the binary 2 into the computer memory.