Shiva wrote:

(theoretically). but that *inbetween* state is where things start to
cook... you've suddenly got an R, and, for those of us who can't spell,
that spells "troble...
Of course, i'm making a huge assumption that you're in some way
interested, rather than spamming...
-dim

There's another way, already extensively in use in what's called -
appropriately enough - "tri-state logic." This has three output states;
ON (e.g. pull high), OFF (e.g. pull low) and DON'T CARE (floating). The
difference is that the ON and OFF states are both low impedance, whereas
the DON'T CARE state is high impedance. Its usage is generally simply to
allow the gate (or other device) to "drop out of the picture" when not
needed.


Wouldn't it be simpiler to use split rails, then you could have +ve, 0,
-ve for the three states.

I would guess that while it would be more efficient to represent a
number in base 3, additional circuits like adders, and multitipliers
would get more interesting...

--
Nick Gorham