scott wrote:
>> "74LS series: Inputs 'float' high to logic 1 if unconnected."
>>
>> Oh crap. Well that would explain a thing or two! >_<
> 
> You should never be leaving any inputs as floating anyway, that's just 
> asking for trouble (for example if you use a different IC series later). 
> Best to always tie your inputs to whatever you want them to be.

Sure. But I'm sitting with the IC between my fingers, poking the pins 
with the end of a wire. Not so easy to tie it all down just for a quick 
test.

So it seems that every input pin is supposed to be connected to one rail 
or the other. (Or an output, which I guess is going to be the most 
common case...)

The page also claims that you can configure an output pin to drive an 
LED so that it lights when the pin goes *low*... Man, electronics is weird!

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