Hi Highwind. I start with the physical computer because that's what most people think of when you say "computer". If you read through to part five, I make exact

Hi Highwind. I start with the physical computer because that's what most people think of when you say "computer". If you read through to part five, I make exactly the point you do - the computer is the software (more accurately an implementation of a Universal Turing Machine) not the hardware at all.