the only reason i would ever want to write a basic OS, would be for knowledge. For the pure sport of learning and breaking down computer architecture.
EDIT

groov: i think about 6-7 years ago i used to be one of those noobs wanting that kind of satisfaction. What i did was re-wrote those programs a hundered time learning a little bit every single time i wrote the damn thing.(IRC client for example). And yet to this day i still re-write the programs i used to back in the day (client->server apps, irc clients, directX based games and such).
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