added CPU notes

free-programming-books-es.md

@@ -8,7 +8,7 @@
 
 
 ###Assembly Language
-* [Machine Code for Beginners](http://www.worldofspectrum.org/infoseekid.cgi?id=2000227) (PDF) by Lisa Watts and Mike Wharton
+* [Machine Code for Beginners](http://www.worldofspectrum.org/infoseekid.cgi?id=2000227) (PDF) by Lisa Watts and Mike Wharton [Z80 and 6502 CPUs]
 
 ###Metalistas
 

free-programming-books.md

@@ -362,8 +362,8 @@
 * [Ralf Brown's Interrupt List](http://www.ctyme.com/rbrown.htm)
 
 ####Non-X86
-* [Machine Code for Beginners](http://www.worldofspectrum.org/infoseekid.cgi?id=2000227) (PDF) by Lisa Watts and Mike Wharton
-* [Machine Language for Beginners](http://archive.org/details/ataribooks-machine-language-for-beginners) by Richard Mansfield
+* [Machine Code for Beginners](http://www.worldofspectrum.org/infoseekid.cgi?id=2000227) (PDF) by Lisa Watts and Mike Wharton [Z80 and 6502 CPUs]
+* [Machine Language for Beginners](http://archive.org/details/ataribooks-machine-language-for-beginners) by Richard Mansfield [6502 CPU]
 
 
 ###Bash