computers based on three value bits?

The 3 value bits are based on the Zero-One-Infinity principle in which these numbers are considered the only true numbers. PC's based off this logic simply require larger logic tables, but much of the same rules apply, these have been called Ternary computers and the states have been represented -1,0,+1
this allows for a MUCH simpler operation as you are always performing an addition rather than an invert and add with binary. Anyway, you should be able to google ternary computers.

thanks a lot