These are awesome, are there more?
https://news.ycombinator.com/item?id=2329397
(We didn't get any comments or many points, but it's nice to see that afterward we've had a number of Leanpub books do better...)
"I'm doing a (free) operating system (just a hobby, won't be big and professional like gnu) for 386(486) AT clones."
https://groups.google.com/forum/#!original/comp.os.minix/dlN...