The book had started as six chapters. We then split it into seven (the memory & CPU chapters, since you asked!), meaning the content of the first submission, due on the 22nd June, changed. It was still intended to be half the book, but that then became 3 ˝ chapters, instead of 3. Neverless, as I’d spent the previous 2 ˝ months writing full time I was already past the half-way mark, and consequently didn’t bother me. In fact, by the time I’d received my first feedback on the 28th June, I was on the last two chapters. And by the time my first advance cheque (for a massive $1000 on the 20th September), and the first technical commentary had arrived (September 29th) I had almost finished the book! This was all a welcome relief, since I had recently begun a new job, and undergoing a gruelling 2 ˝ hour commute… each way. Normally, this would provide ample time to write, and get the book finished. Alas, using a laptop while standing up is more difficult than I’m prepared to attempt, so I managed less than 16 hours a week on the book. Progress throughout this time was frustratingly slow, and I had to sacrifice many weekends to put in a solid 20 hours of work.