The last sentence of that article states, "In particular, all logic gates can be assembled from binary NAND gates." It doesn't mention NOR in the same context

The last sentence of that article states, "In particular, all logic gates can be assembled from binary NAND gates." It doesn't mention NOR in the same context for good reason. NAND gates are preferred because they are more cost effective. "In complicated logical expressions, normally written in terms of other logic functions such as AND, OR, and NOT, writing these in terms of NAND saves on cost, because implementing such circuits using NAND gate yields a more compact result than the alternatives." http://en.wikipedia.org/wiki/NAND_gate http://en.wikipedia.org/wiki/NAND_gate Also see sandGorgon's comment above: http://news.ycombinator.org/item?id=1226971 http://news.ycombinator.org/item?id=1226971