I second your recommendation of "Diagital Apollo". A very interesting book. Two other books worth checking-out are The Apollo Guidance Computer: Architecture a

I second your recommendation of "Diagital Apollo". A very interesting book. Two other books worth checking-out are The Apollo Guidance Computer: Architecture and Operation by Frank O'Brien and Journey to the Moon: The History of the Apollo Guidance Computer by Eldon Hall. The latter book is not particularly well written, but the author was the AGC hardware design lead and this book captures a lot of his first-hand knowledge of the hardware development and testing process.