Numberabbey - 67 Early Spring by Kanddak

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Points of Interest

• Δ 19. Top floor
  This is the top of the water system, where the intake and drainage pump towers push water into the tower that feeds the adder. The water tower has a 10x10 interior on three z-levels and provides enough pressure to flood the adder in a blink when opened. It can also be flushed to the outside if necessary. - Kanddak
• Δ 15. Utilities & Controls
  Ok, there's a lot going on here.
  
  In the southwest are the main controls for the adders. Each column is one bit, with the red and blue levers as inputs and the yellow gears showing the sums. Those gears are engaged and powered to indicate a '1' in the sum and disengaged for a '0'.
  The hallway to the right of that contains the utility levers which control the power and water to different parts of the system. The yellow lever is linked to all of the sum gears and is only there to turn them all off to start with so that the pressure plates will turn them on again.
  Farther to the east is the bottom of the main intake pump tower.
  
  In the northwest are the water wheels and the drain. The drainage pump tower actually continues to the top of the water tower and pumps the used water back into the system, so water is only forced through the drain back into the stream when the adder's shut down and the water tower fills up.
  Although the drainage tower is only one pump wide, its intake is constantly pressurized to 7s whenever water is flowing through the adders, so there is always enough water to keep things running. I've tested it with all outputs wide open; the more water flows through the system, the more water is forced into the drainage pumps and put back into the top.
  The main intake pumps, by contrast, have to wait for the streamwater to come to them. They really just serve to start the system up and make sure evaporation is offset.
  
  A ways over to the west is part of the shaft that dumps the water tower into the adder system. The next level down is where that water is distributed to the individual adders, and also where power is distributed to the sum-display gears.
  
  To the southeast are the stockpiles which hold the pieces for adders when I'm expanding the system. They are presently empty, except for the stone piles used to build the drawbridges. - Kanddak
• Δ 13. Assembly area
  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
• ¶ 12. Adder components
  This is the business part of the fort. There's a half adder on the far right and then seven bits of full adders. To the south are some excavations for the impending expansion to sixteen bits.
  
  Most of the up staircases are for dwarf access but the topmost ones are the water inlets.
  The paired down staircases are the drains. The pressure plates on the right sides of the adders are the sums and the ones on the left are the carries.
  Everything of the same color in each adder shares a trigger. The red and blue buildings are triggered by the input levers, and the green ones by the carry pressure plate of the adder to their right.
  The brown doors are not linked to any triggers and are only there for the convenience of dwarves.
  
  Those are one-tile drawbridges in there, which are perfectly like inverse floodgates, except that whereas floodgates only annihilate water when they close, the bridges would crush anything that got caught in them ;)
  The only inconvenience with them is that it's impossible to tell directly whether they're open or closed; you have to deduce it from the state of the nearby floodgates and the assumption that everything is linked up correctly.
  
  The adders are designed so that whenever the water has a path from the inlet to one of the pressure plates, it doesn't have to travel diagonally, and therefore maintains pressure. The drains are deliberately diagonal, so that the pressurized water piles up on the plates and triggers them, and drains more slowly than it accumulates.
  
  The next level up is the access hallway for construction and maintenence. All of those dwarf-access stairwells are covered with hatches, although some of them didn't show up in the image export. This is necessary to keep the pressurized water from circumventing all of the logic and always triggering all outputs by going through the access tunnels.
  
  There were a number of other considerations in the design which I'll write about in more detail some day. Suffice it to say that I abandoned two forts before starting this one because of irrecoverable design flaws. - Kanddak
• Δ 10. Drainage collection
  The eight pairs of up staircases collect water from the adders, which flows to the intake for the drainage pump tower in the northeast.
  This is two levels below the adders; the extra level of up/down stairs keeps water from unexpectedly backing up and preventing an output from properly draining when its state changes.
  In the northwest you can see the walled-off excavations for the original pump tower, which I overhastily dug out just before realizing it overlapped the planned site of the 32 and 64 adders. - Kanddak

Related Maps:

Numberabbey

• 67 Early Spring [R]

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Related Movies:

• Numberabbey Demonstration

Map details:

• Fortress Name: Numberabbey
• Map Year: 67 Early Spring
• Author: Kanddak
• Submitted by: Kanddak
• Date Added: 06/02/2009