Think about it this way. Say you have 1 bit of memory. Can you store any of the three numbers -1, 0, 1 with that a bit?? No. The only thing a bit can store is 0 or 1.
There have been trinary computers built. They don't use bits, they use trits. A Trit can store -1,0, or 1.
A bit cannot. Saying that a turing machine, whose symbol set is {0,1} can print "A" on its tape, is like saying you can store "-1" >>>in a single bit<<<< on a binary computer.
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