Atom feeds for Appendix A (HDL)

feeds Topics only
http://nand2tetris-questions-and-answers-forum.32033.n3.nabble.com/Appendix-A-HDL-ft32599.xml
feeds Topics and replies
http://nand2tetris-questions-and-answers-forum.32033.n3.nabble.com/Appendix-A-HDL-f32599.xml