Yes, back in 1994. "Lenguaje Ensamblador de los 80x86", which means "80x86 Assembly Language", published by Anaya (major Spanish publisher). It's now out of print, but there were over 20 reprints and it was pretty successful, was recommended at many universities, etc...

http://www.keenzo.com/showproduct.asp?ID=2328952

I wish I had written it in English, it would have helped 10 times as many people and opened 10 times as many doors. Money would have been better too.

I'm writing other stuff now, but it's fiction and as of yet unpublished (and unattempted to). In due time.