jagregory
Book released 1997, made available online in 2001, converted to Markdown/ePub/etc by me in 2013.
This was a labor of love/appreciation for me a couple of years ago over a Christmas break. I went through a retro gamedev period during that break, read a few books like Masters of Doom, and found myself trying to read through the various (relatively poor quality) electronic copies of the Black Book that were floating around. Yak shaving being what it is, I spent most of my Christmas break scraping and cleaning up a few different copies to put this together so I could (more comfortably) read it on my Kindle.
FWIW, these conversions were done with an eye for preserving an interesting piece of gaming/graphics programming history, and aren't really intended to be relevant today.
I also converted the Zen of Assembly Language also by Abrash[1], but it's considerably less relevant than the Black Book in general.