Morningstar Quantitative Ratings for Stocks are generated using an algorithm that compares companies that are not under analyst coverage to peer companies that do receive analyst-driven ratings.
I managed to get an RCX brick with its Serial IR Tower and I managed to find in the Eurobricks forum some information. The following link seems to be the most complete to explain the serial protocol ...
On first launch, you'll see a welcome screen where you can choose how intense you want your experience to be. Don't worry - you can always change settings later!
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