diff --git a/circuits.lua b/circuits.lua
index 4d35103..1a74ad4 100644
--- a/circuits.lua
+++ b/circuits.lua
@@ -85,6 +85,50 @@ function logikraft.collapseConnections(connz)
     do end
 end
 
+-- side: left = 3, top = 0, right = 1, bottom = 2
+local function registerPort(pos,side,j,dir,h,w)
+    local a =
+        (side == 0 and (j-1)) or
+        (side == 1 and (w-1)) or
+        (side == 2 and (j-1)) or
+        (side == 3 and 0) or
+        nil
+    local b =
+        (side == 0 and (h-1)) or
+        (side == 1 and (j-1)) or
+        (side == 2 and 0) or
+        (side == 3 and (j-1)) or
+        nil
+    local d = math.fmod(side + dir + 1,2)
+    local out = 
+        (dir == 0 and {x=pos.x+a,y=pos.y,z=pos.z+b,d=d}) or
+        (dir == 1 and {x=pos.x+b,y=pos.y,z=pos.z-a,d=d}) or
+        (dir == 2 and {x=pos.x-a,y=pos.y,z=pos.z-b,d=d}) or
+        (dir == 3 and {x=pos.x-b,y=pos.y,z=pos.z+a,d=d}) or
+        nil
+    out.x = (math.fmod(side + dir,4)==3 and out.x-1) or out.x
+    out.z = (math.fmod(side + dir,4)==2 and out.z-1) or out.z
+    
+    return out
+        
+end
+local function registerComponentPorts(pos,component,ports,dir)
+    -- Left
+    local dirz = {
+        [0] = component.ports.top,
+        [1] = component.ports.right,
+        [2] = component.ports.bottom,
+        [3] = component.ports.left
+    }
+    for side,prts in pairs(dirz)
+    do 
+        for j,n in pairs(prts)
+        do
+            ports[n] = registerPort(pos,side,j,dir,component.height,component.width)
+        end
+    end
+end
+
 -- {x,y,z,d=0 if x+, 1 if z+}
 function logikraft.compileCircuit(poz)
 
@@ -123,50 +167,9 @@ function logikraft.compileCircuit(poz)
             then
                 local component = logikraft.components[cpblock.name]
                 local cp = {type = cpblock.name, ports = {}, pos = pos}
-                -- Left
-                if component.ports.left
-                then
-                    for j,n in pairs(component.ports.left)
-                    do
-                        if n
-                        then
-                            cp.ports[n] = {x=pos.x-1,y=pos.y,z=pos.z+j-1,d=0}
-                        end
-                    end
-                end
-                -- Right
-                if component.ports.right
-                then
-                    for j,n in pairs(component.ports.right)
-                    do
-                        if n
-                        then
-                            cp.ports[n] = {x=pos.x+component.width-1,y=pos.y,z=pos.z+j-1,d=0}
-                        end
-                    end
-                end
-                -- Top
-                if component.ports.top
-                then
-                    for j,n in pairs(component.ports.top)
-                    do
-                        if n
-                        then
-                            cp.ports[n] = {x=pos.x+j-1,y=pos.y,z=pos.z+component.height-1,d=1}
-                        end
-                    end
-                end
-                -- Bottom
-                if component.ports.bottom
-                then
-                    for j,n in pairs(component.ports.bottom)
-                    do
-                        if n
-                        then
-                            cp.ports[n] = {x=pos.x+j-1,y=pos.y,z=pos.z-1,d=1}
-                        end
-                    end
-                end
+                
+                registerComponentPorts(pos,component,cp.ports,node.param2)
+
                 -- If we have a meta name, we save it
                 local meta = minetest.get_meta(pos)
                 if meta:get_string("logikraft:name") ~= ""
@@ -178,6 +181,7 @@ function logikraft.compileCircuit(poz)
         -- else we just ignore
         end
     end
+    print(dump(components))
 
     logikraft.collapseConnections(connections)
     
@@ -228,7 +232,7 @@ function logikraft.compileCircuit(poz)
 
     -- TODO sort components in inferred components order, for faster computing
 
-    --[[
+    --
     print("Discovered:")
     print(dump(cleanedComponents))
     print(dump(inputs))
@@ -258,8 +262,6 @@ local function computeStep(circuit,connvals,computed)
             then
                 local output = logikraft.components[cmp.type].compute(inputs)
                 print("Component "..cmp.type)
-                print(dump(inputs))
-                print(dump(output))
                 for name,v in pairs(output)
                 do
                     if cmp.ports[name] and connvals[cmp.ports[name]]