Awesome book, I actually bought a hardcopy for $150ish dollars a couple years ago because I wanted the tactile feel to go with the brilliant words.
For electronic consumption there's an excellent project on github that was mentioned here on hacker news earlier in the year / last year. You can find that here https://github.com/jagregory/abrash-black-book/releases and it is the contents of the extreme edition formatted for modern e-readers.
I thought I'd have a quick look at a couple of the pages online to see if there was anything of interest. Several hours later... I've read most of the later chapters and a few of the earlier ones and already learned more about graphics programming and low-level code optimisation than I imagined possible. What an incredible book!
For electronic consumption there's an excellent project on github that was mentioned here on hacker news earlier in the year / last year. You can find that here https://github.com/jagregory/abrash-black-book/releases and it is the contents of the extreme edition formatted for modern e-readers.