A computer that uses HEX instead of binaries [closed]

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http://serverfault.com – All computers use logic gates that have just two states 0 and 1. Has it been attempted to use logic gates that have more the two states? What would be the pros and cons of such a machine if ever made? One advantage that I can think of is that a 32 bit machine would be able to access a lot more RAM than it can with 2 logic states. Also smaller RAM would have a lot more memory. (HowTos)