I built an eight-bit ripple-carry adder over the weekend and have just started the digging to take it up to sixteen bits.. I've seen a few theoretical designs for full adders on the wiki and such, but never a complete system.
See it in action here: http://mkv25.net/dfma/movie-1084-numberabbeydemonstration
Here's where all the pieces of an adder get put together.
The lever by each of the lower workshops is specific to the dwarf meant to work there, so when it's time to make the pieces of another adder, the lever is ordered to be pulled and the door is locked as soon as the dwarf comes in. Then I order three mechanisms and eight floodgates. Once the floodgates are done, I unlock the door to the microcline stockpile and order two doors and two hatches.
You can't see those in this export, but they are used for a system that seals every pressure plate in the adder to store results, so that they can be transferred to one of the input rows in order to add several numbers. The microcline lever in the utility area controls this.
Once everything's done, I let the dwarves out, let the stockpiles get refilled, lock up the colored-stone-working area, and order forty mechanisms from the manager screen, to be made out of regular stone and used for linkages.
The gabbro stockpile is for making mechanisms to use for gear assemblies to distribute power to the sum display gears, which are made in batches of four each time I expand the system by four bits — at which time I also need to order four doors and twenty hatch covers for the access tunnels to the north of here. - Kanddak
There are 11 comments for this map series, last post 2009-03-31
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You can download the compressed map file: 2009-02/kanddak-Numberabbey-region8-67-3142.fdf-map but you will need the .NET version of SL's DF Map Compressor to convert to the .PNG image format.