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Here's a knex binary calculator that i built about a year ago but was a bit to lazy to post until now :P

Anyways, heres some credit where it needs to be given:
my friend Evan for helping me build it
that great man at woodgears.ca for the concept

I spent the last weekend building a simple 3-bit adder. It was a good lesson in engineering, particularly making sure the ball didn't go so fast it went flying or so slow the flip-flop didn't change state. My next goal is to add another computational bit, and allow subtraction through the two's complement. -Y
 very nice!!
yeah, I made something like this once, it can be done alot easier, lol, but this is very nice!<br />
&nbsp;haha i know, but less complex things are less visually appealing :P (and not as good... haha)
yeah, this thing is very interesting :-)<br />
That's cool! I could never figure out how to build one of these, lol.<br />
amazing! 5*

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