Right. They run different versions of windows, many of which are incompatible with each other. Most of the versions have changes to them that make them incapable of being used and programmed on in non-generic ways as a single build. So your point was? And they (MS) still pull stuff like Metro in the search of the *single* solution.
Windows 95 -> Windows ME -> Windows XP -> Windows Vista -> Windows 7 -> Windows 8.... (not including the server versions or mobile versions of MS Windows).
For our next trick, we shall make one vehicle that runs on two and four wheels, flies, floats, submerges, is sporty, family friendly, industrial strength, cheap, luxurious, compact, roomy
Ok, So 1 Trillion over 10 years. 100 Billion per year. That is 20 billion per state per year.
In comparison, the average gross funding per state for education in 2011 was 16.17 billion dollars. Our number one curable cause of poverty and crime is lack of a good education. That money doubles the budget of every state's educational funds and has 25% unspent. Small change? Insignificant? I think not.
Z80 is what I cut my teeth on for serious binary programming. I really like the index instructions and the relative simplicity of the overall instruction set compared to others I worked with.