All I can find is the definition, which states that pin one is in the middle of the top at least in the 44 pin package. http://www.interfacebus.com/ic-package-

All I can find is the definition, which states that pin one is in the middle of the top at least in the 44 pin package. http://www.interfacebus.com/ic-package-plcc-dimension-outline-drawing.html http://www.interfacebus.com/ic-package-plcc-dimension-outlin... No idea on the history though, hopefully someone can enlighten us, Google did not.