scott wrote:
>> How many resistors can you see? Because I count NONE!
> 
> Sure, but that circuit does not show how you generate the inputs A,B,Cin 
> or how to connect the output to an LED.
> 
> Both of which require some basic knowledge of analogue electronics.

NNOOOOOOOOOO!!!! X_X



Well anyway, FWIW, the IC managed to drive the LED just fine. (I bought 
special 5V LEDs; apparently normal ones take roughly 3V.) It's just that 
I couldn't get the right truth table out of it. :-(

You think using a 2-pole switch with the poles connected to each of the 
power rails will do it?

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