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Mark Tarrabain wrote:
> When A and C are both high, A+C will therefore be low, so the left
> piston will be down. So the bottommost switch on the left piston will
> already be down to receive A&B and produce a carry out. If only one of
> A and C are high, the left piston will be up, so the left bottom switch
> and the switch above it will be up and therefore be ready to receive
> whatever B happens to be, which again must be the carry.
Oops... after rereading what I wrote, I see made a typo there, and I can
see how it could be very, very confusing.
What I meant to say was that the bottommost switch on the left piston
will already be down to receive A & _C_, which is high and will produce
a carry out.
>> Mark
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Message is in Reply To:
![](/news/x.gif) | | Re: A better full adder!
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| (...) Thanks. Here's how it works: Consider only the right piston for a moment. The output of this subsystem (which will be driving the left piston) is simply (A&~C)|(~A&C), which is an XOR operator, or a half-adder. So what drives the left piston (...) (21 years ago, 28-Jun-03, to lugnet.technic, lugnet.robotics)
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27 Messages in This Thread: ![A better full adder! -Mark Tarrabain (26-Jun-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/246.gif) ![Re: A better full adder! -Mark Riley (26-Jun-03 to lugnet.technic, lugnet.robotics)](/news/x.gif)
![](/news/x.gif) ![](/news/68.gif) ![Re: A better full adder! -Kevin L. Clague (26-Jun-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: A better full adder! -Mark Tarrabain (26-Jun-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: A better full adder! -Kevin L. Clague (26-Jun-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: A better full adder! -Kevin L. Clague (26-Jun-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: A better full adder! -Mark Tarrabain (26-Jun-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: A better full adder! -Kevin L. Clague (27-Jun-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: A better full adder! -Mark Tarrabain (27-Jun-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: A better full adder! -Kevin L. Clague (28-Jun-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/246.gif) ![Re: A better full adder! -Mark Tarrabain (28-Jun-03 to lugnet.technic, lugnet.robotics)](/news/x.gif)
![](/news/x.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: A better full adder! -Mark Tarrabain (28-Jun-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/246.gif) ![Re: A better full adder! -Kevin L. Clague (28-Jun-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/246.gif) ![Re: A better full adder! -Mark Tarrabain (28-Jun-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![You are here](/news/here.gif)
![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: A better full adder! -Brian H. Nielsen (1-Jul-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: A better full adder! -Mark Tarrabain (1-Jul-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/246.gif) ![Re: A better full adder! -Ross Crawford (1-Jul-03 to lugnet.technic, lugnet.robotics)](/news/x.gif)
![](/news/x.gif) ![](/news/28.gif) ![](/news/x.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: A better full adder! -Brian H. Nielsen (1-Jul-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: A better full adder! -Mark Tarrabain (1-Jul-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: A better full adder! -Brian H. Nielsen (1-Jul-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: A better full adder! -Brian H. Nielsen (2-Jul-03 to lugnet.technic, lugnet.robotics)](/news/x.gif)
![](/news/x.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: A better full adder! -Kevin L. Clague (1-Jul-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/246.gif) ![Re: A better full adder! -Mark Tarrabain (1-Jul-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: A better full adder! -Kevin L. Clague (1-Jul-03 to lugnet.technic, lugnet.robotics)](/news/x.gif)
![](/news/x.gif) ![](/news/x.gif) ![](/news/68.gif) ![Re: A better full adder! -Mark Tarrabain (1-Jul-03 to lugnet.technic, lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: A better full adder! -Kevin L. Clague (1-Jul-03 to lugnet.technic, lugnet.robotics)](/news/x.gif)
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