diff --git a/assets/items.psd b/assets/items.psd
index 9c65a2b86..78087d3e9 100644
Binary files a/assets/items.psd and b/assets/items.psd differ
diff --git a/build.properties b/build.properties
index 959ba942b..2bbe55bed 100644
--- a/build.properties
+++ b/build.properties
@@ -1,7 +1,7 @@
 minecraft.version=1.7.10
 forge.version=10.13.3.1395-1710ls
 
-oc.version=1.5.11
+oc.version=1.5.12
 oc.subversion=
 
 ae2.version=rv2-beta-26
diff --git a/src/main/resources/assets/opencomputers/lang/en_US.lang b/src/main/resources/assets/opencomputers/lang/en_US.lang
index 527629c23..c31a753a4 100644
--- a/src/main/resources/assets/opencomputers/lang/en_US.lang
+++ b/src/main/resources/assets/opencomputers/lang/en_US.lang
@@ -45,6 +45,7 @@ item.oc.ALU.name=Arithmetic Logic Unit (ALU)
 item.oc.Analyzer.name=Analyzer
 item.oc.APU0.name=Accelerated Processing Unit (APU) (Tier 1)
 item.oc.APU1.name=Accelerated Processing Unit (APU) (Tier 2)
+item.oc.APU2.name=Accelerated Processing Unit (APU) (Creative)
 item.oc.ArrowKeys.name=Arrow Keys
 item.oc.ButtonGroup.name=Button Group
 item.oc.CardBase.name=Card Base
diff --git a/src/main/resources/assets/opencomputers/textures/items/APU2.png b/src/main/resources/assets/opencomputers/textures/items/APU2.png
new file mode 100644
index 000000000..4a09b42d6
Binary files /dev/null and b/src/main/resources/assets/opencomputers/textures/items/APU2.png differ
diff --git a/src/main/resources/assets/opencomputers/textures/items/APU2.png.mcmeta b/src/main/resources/assets/opencomputers/textures/items/APU2.png.mcmeta
new file mode 100644
index 000000000..622c31336
--- /dev/null
+++ b/src/main/resources/assets/opencomputers/textures/items/APU2.png.mcmeta
@@ -0,0 +1,18 @@
+{
+  "animation": {
+    "frametime": 1,
+    "frames": [
+      { "index": 0, "time": 3 },
+      { "index": 1, "time": 3 },
+      { "index": 2, "time": 3 },
+      { "index": 3, "time": 3 },
+      { "index": 4, "time": 3 },
+      { "index": 5, "time": 3 },
+      { "index": 4, "time": 3 },
+      { "index": 3, "time": 3 },
+      { "index": 2, "time": 3 },
+      { "index": 1, "time": 3 },
+      { "index": 0, "time": 3 }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/src/main/scala/li/cil/oc/Constants.scala b/src/main/scala/li/cil/oc/Constants.scala
index 413ceff3d..be261a68d 100644
--- a/src/main/scala/li/cil/oc/Constants.scala
+++ b/src/main/scala/li/cil/oc/Constants.scala
@@ -49,6 +49,7 @@ object Constants {
     final val Alu = "alu"
     final val Analyzer = "analyzer"
     final val AngelUpgrade = "angelUpgrade"
+    final val APUCreative = "apuCreative"
     final val APUTier1 = "apu1"
     final val APUTier2 = "apu2"
     final val ArrowKeys = "arrowKeys"
diff --git a/src/main/scala/li/cil/oc/client/renderer/block/Print.scala b/src/main/scala/li/cil/oc/client/renderer/block/Print.scala
index 979c7bcfb..e88af409a 100644
--- a/src/main/scala/li/cil/oc/client/renderer/block/Print.scala
+++ b/src/main/scala/li/cil/oc/client/renderer/block/Print.scala
@@ -17,7 +17,7 @@ object Print {
 
   def render(data: PrintData, state: Boolean, facing: ForgeDirection, x: Int, y: Int, z: Int, block: Block, renderer: RenderBlocks): Unit = {
     val shapes = if (state) data.stateOn else data.stateOff
-    if (shapes.size == 0) {
+    if (shapes.isEmpty) {
       printBlock.textureOverride = Option(resolveTexture("missingno"))
       renderer.setRenderBounds(0, 0, 0, 1, 1, 1)
       renderer.renderStandardBlock(block, x, y, z)
diff --git a/src/main/scala/li/cil/oc/common/block/Keyboard.scala b/src/main/scala/li/cil/oc/common/block/Keyboard.scala
index bbef0dc2d..67877a9f6 100644
--- a/src/main/scala/li/cil/oc/common/block/Keyboard.scala
+++ b/src/main/scala/li/cil/oc/common/block/Keyboard.scala
@@ -2,10 +2,12 @@ package li.cil.oc.common.block
 
 import java.util.Random
 
+import li.cil.oc.Constants
 import li.cil.oc.api
 import li.cil.oc.common.tileentity
 import li.cil.oc.util.BlockPosition
 import li.cil.oc.util.ExtendedWorld._
+import li.cil.oc.util.InventoryUtils
 import net.minecraft.block.Block
 import net.minecraft.block.material.Material
 import net.minecraft.entity.player.EntityPlayer
@@ -88,10 +90,12 @@ class Keyboard extends SimpleBlock(Material.rock) with traits.SpecialBlock {
 
   override def onNeighborBlockChange(world: World, x: Int, y: Int, z: Int, block: Block) =
     world.getTileEntity(x, y, z) match {
-      case keyboard: tileentity.Keyboard if canPlaceBlockOnSide(world, x, y, z, keyboard.facing.getOpposite) => // Can stay.
+      case keyboard: tileentity.Keyboard =>
+        if (!canPlaceBlockOnSide(world, x, y, z, keyboard.facing.getOpposite)) {
+          world.setBlockToAir(x, y, z)
+          InventoryUtils.spawnStackInWorld(BlockPosition(x, y, z, world), api.Items.get(Constants.BlockName.Keyboard).createItemStack(1))
+        }
       case _ =>
-        dropBlockAsItem(world, x, y, z, world.getBlockMetadata(x, y, z), 0)
-        world.setBlockToAir(x, y, z)
     }
 
   override def onBlockActivated(world: World, x: Int, y: Int, z: Int, player: EntityPlayer, side: ForgeDirection, hitX: Float, hitY: Float, hitZ: Float) =
diff --git a/src/main/scala/li/cil/oc/common/block/ServerRack.scala b/src/main/scala/li/cil/oc/common/block/ServerRack.scala
index 65a7357d7..aa3c31675 100644
--- a/src/main/scala/li/cil/oc/common/block/ServerRack.scala
+++ b/src/main/scala/li/cil/oc/common/block/ServerRack.scala
@@ -28,7 +28,7 @@ class ServerRack extends RedstoneAware with traits.SpecialBlock with traits.Powe
 
   @SideOnly(Side.CLIENT)
   override def getMixedBrightnessForBlock(world: IBlockAccess, x: Int, y: Int, z: Int) = {
-    world.getTileEntity(x, y, z) match {
+    if (y >= 0 && y < world.getHeight) world.getTileEntity(x, y, z) match {
       case rack: tileentity.ServerRack =>
         def brightness(x: Int, y: Int, z: Int) = world.getLightBrightnessForSkyBlocks(x, y, z, getLightValue(world, x, y, z))
         val value = brightness(x + rack.facing.offsetX, y + rack.facing.offsetY, z + rack.facing.offsetZ)
@@ -37,6 +37,7 @@ class ServerRack extends RedstoneAware with traits.SpecialBlock with traits.Powe
         ((skyBrightness * 3 / 4) << 20) | ((blockBrightness * 3 / 4) << 4)
       case _ => super.getMixedBrightnessForBlock(world, x, y, z)
     }
+    else super.getMixedBrightnessForBlock(world, x, y, z)
   }
 
   override def isBlockSolid(world: IBlockAccess, x: Int, y: Int, z: Int, side: ForgeDirection) = side != ForgeDirection.SOUTH
diff --git a/src/main/scala/li/cil/oc/common/init/Items.scala b/src/main/scala/li/cil/oc/common/init/Items.scala
index 9d02389b9..3fd66423c 100644
--- a/src/main/scala/li/cil/oc/common/init/Items.scala
+++ b/src/main/scala/li/cil/oc/common/init/Items.scala
@@ -288,6 +288,8 @@ object Items extends ItemAPI {
 
       Option(get(Constants.ItemName.SignUpgrade).createItemStack(1)),
       Option(get(Constants.ItemName.PistonUpgrade).createItemStack(1)),
+      Option(get(Constants.BlockName.Geolyzer).createItemStack(1)),
+      Option(get(Constants.ItemName.NavigationUpgrade).createItemStack(1)),
 
       Option(get(Constants.ItemName.GraphicsCardTier2).createItemStack(1)),
       Option(get(Constants.ItemName.RedstoneCardTier2).createItemStack(1)),
@@ -533,5 +535,8 @@ object Items extends ItemAPI {
 
     // 1.5.11
     Recipes.addItem(new item.HoverBoots(), Constants.ItemName.HoverBoots, "oc:hoverBoots")
+
+    // 1.5.12
+    registerItem(new item.APU(multi, Tier.Three), Constants.ItemName.APUCreative)
   }
 }
diff --git a/src/main/scala/li/cil/oc/common/item/APU.scala b/src/main/scala/li/cil/oc/common/item/APU.scala
index a03c2457e..57835d687 100644
--- a/src/main/scala/li/cil/oc/common/item/APU.scala
+++ b/src/main/scala/li/cil/oc/common/item/APU.scala
@@ -1,11 +1,20 @@
 package li.cil.oc.common.item
 
+import li.cil.oc.common.Tier
+import li.cil.oc.util.Rarity
+import net.minecraft.item.EnumRarity
+import net.minecraft.item.ItemStack
+
 import scala.language.existentials
 
 class APU(val parent: Delegator, val tier: Int) extends traits.Delegate with traits.ItemTier with traits.CPULike with traits.GPULike {
   override val unlocalizedName = super[Delegate].unlocalizedName + tier
 
-  override def cpuTier = tier + 1
+  override def rarity(stack: ItemStack): EnumRarity =
+    if (tier == Tier.Three) Rarity.byTier(Tier.Four)
+    else super.rarity(stack)
+
+  override def cpuTier = math.min(Tier.Three, tier + 1)
 
   override def gpuTier = tier
 
diff --git a/src/main/scala/li/cil/oc/common/item/Server.scala b/src/main/scala/li/cil/oc/common/item/Server.scala
index b31b0c19f..a2272e7b2 100644
--- a/src/main/scala/li/cil/oc/common/item/Server.scala
+++ b/src/main/scala/li/cil/oc/common/item/Server.scala
@@ -43,7 +43,7 @@ class Server(val parent: Delegator, val tier: Int) extends traits.Delegate {
         val itemName = item.getDisplayName
         items += itemName -> (if (items.contains(itemName)) items(itemName) + 1 else 1)
       }
-      if (items.size > 0) {
+      if (items.nonEmpty) {
         tooltip.addAll(Tooltip.get("Server.Components"))
         for (itemName <- items.keys.toArray.sorted) {
           tooltip.add("- " + items(itemName) + "x " + itemName)
diff --git a/src/main/scala/li/cil/oc/common/template/TabletTemplate.scala b/src/main/scala/li/cil/oc/common/template/TabletTemplate.scala
index 80bc37272..775a0d6d8 100644
--- a/src/main/scala/li/cil/oc/common/template/TabletTemplate.scala
+++ b/src/main/scala/li/cil/oc/common/template/TabletTemplate.scala
@@ -17,7 +17,14 @@ object TabletTemplate extends Template {
   override protected val suggestedComponents = Array(
     "BIOS" -> hasComponent(Constants.ItemName.EEPROM) _,
     "Keyboard" -> hasComponent(Constants.BlockName.Keyboard) _,
-    "GraphicsCard" -> ((inventory: IInventory) => Array(Constants.ItemName.GraphicsCardTier1, Constants.ItemName.GraphicsCardTier2, Constants.ItemName.GraphicsCardTier3).exists(name => hasComponent(name)(inventory))),
+    "GraphicsCard" -> ((inventory: IInventory) => Array(
+      Constants.ItemName.APUCreative,
+      Constants.ItemName.APUTier1,
+      Constants.ItemName.APUTier2,
+      Constants.ItemName.GraphicsCardTier1,
+      Constants.ItemName.GraphicsCardTier2,
+      Constants.ItemName.GraphicsCardTier3).
+      exists(name => hasComponent(name)(inventory))),
     "OS" -> hasFileSystem _)
 
   override protected def hostClass = classOf[internal.Tablet]
diff --git a/src/main/scala/li/cil/oc/common/template/Template.scala b/src/main/scala/li/cil/oc/common/template/Template.scala
index 8a0b5b7f3..2e1e59a53 100644
--- a/src/main/scala/li/cil/oc/common/template/Template.scala
+++ b/src/main/scala/li/cil/oc/common/template/Template.scala
@@ -23,7 +23,14 @@ abstract class Template {
     "BIOS" -> hasComponent(Constants.ItemName.EEPROM) _,
     "Screen" -> hasComponent(Constants.BlockName.ScreenTier1) _,
     "Keyboard" -> hasComponent(Constants.BlockName.Keyboard) _,
-    "GraphicsCard" -> ((inventory: IInventory) => Array(Constants.ItemName.GraphicsCardTier1, Constants.ItemName.GraphicsCardTier2, Constants.ItemName.GraphicsCardTier3).exists(name => hasComponent(name)(inventory))),
+    "GraphicsCard" -> ((inventory: IInventory) => Array(
+      Constants.ItemName.APUCreative,
+      Constants.ItemName.APUTier1,
+      Constants.ItemName.APUTier2,
+      Constants.ItemName.GraphicsCardTier1,
+      Constants.ItemName.GraphicsCardTier2,
+      Constants.ItemName.GraphicsCardTier3).
+      exists(name => hasComponent(name)(inventory))),
     "Inventory" -> hasInventory _,
     "OS" -> hasFileSystem _)
 
diff --git a/src/main/scala/li/cil/oc/common/tileentity/traits/Computer.scala b/src/main/scala/li/cil/oc/common/tileentity/traits/Computer.scala
index 58e8bdf4e..ec3a0538f 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/traits/Computer.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/traits/Computer.scala
@@ -16,6 +16,7 @@ import li.cil.oc.common.tileentity.traits
 import li.cil.oc.integration.opencomputers.DriverRedstoneCard
 import li.cil.oc.integration.stargatetech2.DriverAbstractBusCard
 import li.cil.oc.integration.util.Waila
+import li.cil.oc.server.agent
 import li.cil.oc.server.{PacketSender => ServerPacketSender}
 import li.cil.oc.util.ExtendedNBT._
 import net.minecraft.entity.player.EntityPlayer
@@ -194,7 +195,10 @@ trait Computer extends Environment with ComponentInventory with Rotatable with B
   }
 
   override def isUseableByPlayer(player: EntityPlayer) =
-    super.isUseableByPlayer(player) && canInteract(player.getCommandSenderName)
+    super.isUseableByPlayer(player) && (player match {
+      case fakePlayer: agent.Player => canInteract(fakePlayer.agent.ownerName())
+      case _ => canInteract(player.getCommandSenderName)
+    })
 
   override protected def onRotationChanged() {
     super.onRotationChanged()
diff --git a/src/main/scala/li/cil/oc/integration/Mods.scala b/src/main/scala/li/cil/oc/integration/Mods.scala
index 0de8a9dbe..9e3c1bcdc 100644
--- a/src/main/scala/li/cil/oc/integration/Mods.scala
+++ b/src/main/scala/li/cil/oc/integration/Mods.scala
@@ -34,7 +34,7 @@ object Mods {
   val ComputerCraft = new SimpleMod(IDs.ComputerCraft)
   val CraftingCosts = new SimpleMod(IDs.CraftingCosts)
   val DeepStorageUnit = new ClassBasedMod(IDs.DeepStorageUnit, "powercrystals.minefactoryreloaded.api.IDeepStorageUnit")()
-  val ElectricalAge = new SimpleMod(IDs.ElectricalAge)
+  val ElectricalAge = new SimpleMod(IDs.ElectricalAge, providesPower = true)
   val EnderIO = new SimpleMod(IDs.EnderIO)
   val EnderStorage = new SimpleMod(IDs.EnderStorage)
   val Factorization = new SimpleMod(IDs.Factorization, providesPower = true)
diff --git a/src/main/scala/li/cil/oc/integration/appeng/NetworkControl.scala b/src/main/scala/li/cil/oc/integration/appeng/NetworkControl.scala
index 9ad963421..52a4c4869 100644
--- a/src/main/scala/li/cil/oc/integration/appeng/NetworkControl.scala
+++ b/src/main/scala/li/cil/oc/integration/appeng/NetworkControl.scala
@@ -55,7 +55,7 @@ trait NetworkControl[AETile >: Null <: TileEntity with IGridProxyable with IActi
         case Some(pattern) => pattern.getOutputs.find(_.isSameType(stack)).get
         case _ => stack.copy.setStackSize(0) // Should not be possible, but hey...
       }
-      new Craftable(tile, result)
+      new NetworkControl.Craftable(tile, result)
     }).toArray)
   }
 
@@ -101,8 +101,11 @@ trait NetworkControl[AETile >: Null <: TileEntity with IGridProxyable with IActi
       filter.get("name").forall(_.equals(Item.itemRegistry.getNameForObject(stack.getItem))) &&
       filter.get("label").forall(_.equals(stack.getItemStack.getDisplayName))
   }
+}
 
-  class Craftable(var controller: AETile, var stack: IAEItemStack) extends AbstractValue with ICraftingRequester {
+object NetworkControl {
+
+  class Craftable(var controller: TileEntity with IGridProxyable with IActionHost, var stack: IAEItemStack) extends AbstractValue with ICraftingRequester {
     def this() = this(null, null)
 
     private val links = mutable.Set.empty[ICraftingLink]
@@ -186,8 +189,8 @@ trait NetworkControl[AETile >: Null <: TileEntity with IGridProxyable with IActi
         EventHandler.schedule(() => {
           val world = DimensionManager.getWorld(dimension)
           val tileEntity = world.getTileEntity(x, y, z)
-          if (tileEntity != null && tileEntity.isInstanceOf[AETile]) {
-            controller = tileEntity.asInstanceOf[AETile]
+          if (tileEntity != null && tileEntity.isInstanceOf[TileEntity with IGridProxyable with IActionHost]) {
+            controller = tileEntity.asInstanceOf[TileEntity with IGridProxyable with IActionHost]
           }
         })
       }
@@ -256,4 +259,4 @@ trait NetworkControl[AETile >: Null <: TileEntity with IGridProxyable with IActi
     }
   }
 
-}
+}
\ No newline at end of file
diff --git a/src/main/scala/li/cil/oc/integration/opencomputers/DriverAPU.scala b/src/main/scala/li/cil/oc/integration/opencomputers/DriverAPU.scala
index 97fa16316..a41112f13 100644
--- a/src/main/scala/li/cil/oc/integration/opencomputers/DriverAPU.scala
+++ b/src/main/scala/li/cil/oc/integration/opencomputers/DriverAPU.scala
@@ -14,12 +14,14 @@ import net.minecraft.item.ItemStack
 object DriverAPU extends DriverCPU with HostAware with EnvironmentAware {
   override def worksWith(stack: ItemStack) = isOneOf(stack,
     api.Items.get(Constants.ItemName.APUTier1),
-    api.Items.get(Constants.ItemName.APUTier2))
+    api.Items.get(Constants.ItemName.APUTier2),
+    api.Items.get(Constants.ItemName.APUCreative))
 
   override def createEnvironment(stack: ItemStack, host: EnvironmentHost) =
     gpuTier(stack) match {
       case Tier.One => new component.GraphicsCard.Tier1()
       case Tier.Two => new component.GraphicsCard.Tier2()
+      case Tier.Three => new component.GraphicsCard.Tier3()
       case _ => null
     }
 
diff --git a/src/main/scala/li/cil/oc/integration/opencomputers/DriverUpgradeHover.scala b/src/main/scala/li/cil/oc/integration/opencomputers/DriverUpgradeHover.scala
index 1ea62e678..1f80c0029 100644
--- a/src/main/scala/li/cil/oc/integration/opencomputers/DriverUpgradeHover.scala
+++ b/src/main/scala/li/cil/oc/integration/opencomputers/DriverUpgradeHover.scala
@@ -3,13 +3,14 @@ package li.cil.oc.integration.opencomputers
 import li.cil.oc.Constants
 import li.cil.oc.api
 import li.cil.oc.api.driver.EnvironmentHost
+import li.cil.oc.api.driver.item.HostAware
 import li.cil.oc.common.Slot
 import li.cil.oc.common.Tier
 import li.cil.oc.common.item
 import li.cil.oc.common.item.Delegator
 import net.minecraft.item.ItemStack
 
-object DriverUpgradeHover extends Item {
+object DriverUpgradeHover extends Item with HostAware {
   override def worksWith(stack: ItemStack) = isOneOf(stack,
     api.Items.get(Constants.ItemName.HoverUpgradeTier1),
     api.Items.get(Constants.ItemName.HoverUpgradeTier2))
diff --git a/src/main/scala/li/cil/oc/server/driver/Registry.scala b/src/main/scala/li/cil/oc/server/driver/Registry.scala
index a2f58e0bd..2c19dd94f 100644
--- a/src/main/scala/li/cil/oc/server/driver/Registry.scala
+++ b/src/main/scala/li/cil/oc/server/driver/Registry.scala
@@ -77,7 +77,7 @@ private[oc] object Registry extends api.detail.DriverAPI {
       val hostAware = items.collect {
         case driver: HostAware if driver.worksWith(stack) => driver
       }
-      if (hostAware.size > 0) {
+      if (hostAware.nonEmpty) {
         hostAware.find(_.worksWith(stack, host)).orNull
       }
       else driverFor(stack)
@@ -112,7 +112,7 @@ private[oc] object Registry extends api.detail.DriverAPI {
       memo.get(valueRef)
     }
     else valueRef match {
-      case null | Unit | None => null
+      case null | None => null
 
       case arg: java.lang.Boolean => arg
       case arg: java.lang.Byte => arg
diff --git a/src/main/scala/li/cil/oc/server/machine/Machine.scala b/src/main/scala/li/cil/oc/server/machine/Machine.scala
index 2a2ecaec9..c045c38b4 100644
--- a/src/main/scala/li/cil/oc/server/machine/Machine.scala
+++ b/src/main/scala/li/cil/oc/server/machine/Machine.scala
@@ -26,6 +26,7 @@ import li.cil.oc.api.prefab
 import li.cil.oc.common.EventHandler
 import li.cil.oc.common.SaveHandler
 import li.cil.oc.common.Slot
+import li.cil.oc.common.Tier
 import li.cil.oc.common.tileentity
 import li.cil.oc.server.PacketSender
 import li.cil.oc.server.driver.Registry
@@ -112,7 +113,7 @@ class Machine(val host: MachineHost) extends prefab.ManagedEnvironment with mach
     }))
     maxCallBudget = components.foldLeft(0.0)((sum, item) => sum + (Option(item) match {
       case Some(stack) => Option(Driver.driverFor(stack, host.getClass)) match {
-        case Some(driver: Processor) if driver.slot(stack) == Slot.CPU => Settings.get.callBudgets(driver.tier(stack))
+        case Some(driver: Processor) if driver.slot(stack) == Slot.CPU => Settings.get.callBudgets(driver.tier(stack) max Tier.One min Tier.Three)
         case _ => 0
       }
       case _ => 0
@@ -832,7 +833,7 @@ class Machine(val host: MachineHost) extends prefab.ManagedEnvironment with mach
     }
 
   private def close() = state.synchronized(
-    if (state.size == 0 || state.top != Machine.State.Stopped) {
+    if (state.isEmpty || state.top != Machine.State.Stopped) {
       this.synchronized {
         state.clear()
         state.push(Machine.State.Stopped)