disk drive and floppy disks (disk drives are mountable and act as a "proxy" for the item in them); minor refactoring;

assets/opencomputers/lang/de_DE.lang

@@ -3,6 +3,8 @@ oc.block.Computer.name=Computer
 oc.block.Keyboard.name=Tastatur
 oc.block.Screen.name=Bildschirm
 oc.container.computer=Computer
+oc.container.disk_drive=Diskettenlaufwerk
+oc.item.Disk.name=Diskette
 oc.item.GraphicsCard.name=Grafikkarte
 oc.item.HardDiskDrive2m.name=Festplatte (2MB)
 oc.item.HardDiskDrive4m.name=Festplatte (4MB)

assets/opencomputers/lang/en_US.lang

@@ -3,6 +3,8 @@ oc.block.Computer.name=Computer
 oc.block.Keyboard.name=Keyboard
 oc.block.Screen.name=Screen
 oc.container.computer=Computer
+oc.container.disk_drive=Disk Drive
+oc.item.Disk.name=Floppy Disk
 oc.item.GraphicsCard.name=Graphics Card
 oc.item.HardDiskDrive2m.name=Hard Disk Drive (2MB)
 oc.item.HardDiskDrive4m.name=Hard Disk Drive (4MB)

assets/opencomputers/lua/kernel.lua

@@ -180,7 +180,9 @@ local function main(args)
       debug.sethook(co, checkDeadline, "", 10000)
     end
     local result = table.pack(coroutine.resume(co, table.unpack(args, 1, args.n)))
-    if result[1] then
+    if coroutine.status(co) == "dead" then
+      error("computer stopped unexpectedly", 0)
+    elseif result[1] then
       args = table.pack(coroutine.yield(result[2])) -- system yielded value
     else
       error(result[2], 0)

assets/opencomputers/lua/rom/lib/event.lua

@@ -109,9 +109,10 @@ end
 function event.wait(seconds)
   seconds = seconds or 0/0
   checkArg(1, seconds, "number")
-  local target = os.uptime() + (seconds == seconds and seconds or 0)
+  local function isNaN(n) return n ~= n end
+  local target = os.uptime() + (isNaN(seconds) and 0 or seconds)
   repeat
-    local closest = seconds == seconds and target or math.huge
+    local closest = isNaN(seconds) and math.huge or target
     for _, info in pairs(timers) do
       if info.after < closest then
         closest = info.after

assets/opencomputers/lua/rom/lib/fs.lua

@@ -23,7 +23,8 @@ end
 -------------------------------------------------------------------------------
 
 local function onComponentAdded(_, address)
-  if component.type(address) == "filesystem" and
+  local componentType = component.type(address)
+  if (componentType == "filesystem" or componentType == "disk_drive") and
      address ~= os.romAddress() and
      address ~= os.tmpAddress()
   then
@@ -44,7 +45,8 @@ local function onComponentAdded(_, address)
 end
 
 local function onComponentRemoved(_, address)
-  if component.type(address) == "filesystem" then
+  local componentType = component.type(address)
+  if componentType == "filesystem" or componentType == "disk_drive" then
     fs.umount(address)
   end
 end

li/cil/oc/Blocks.scala

@@ -14,6 +14,7 @@ object Blocks {
   var powerDistributor: PowerDistributor = null
 
   var adapter: Adapter = null
+  var diskDrive: DiskDrive = null
 
   def init() {
     // IMPORTANT: the multi block must come first, since the sub blocks will
@@ -30,5 +31,6 @@ object Blocks {
     powerDistributor = new PowerDistributor(blockSimple)
 
     adapter = new Adapter(blockSimple)
+    diskDrive = new DiskDrive(blockSimple)
   }
 }

li/cil/oc/Items.scala

@@ -9,28 +9,29 @@ object Items {
   var rs: item.RedstoneCard = null
   var lan: item.NetworkCard = null
 
-  var ram32k: item.Memory = null
-  var ram64k: item.Memory = null
-  var ram128k: item.Memory = null
+  var ram1: item.Memory = null
+  var ram2: item.Memory = null
+  var ram3: item.Memory = null
 
-  var hdd2: item.Hdd = null
-  var hdd4: item.Hdd = null
-  var hdd8: item.Hdd = null
+  var hdd1: item.HardDiskDrive = null
+  var hdd2: item.HardDiskDrive = null
+  var hdd3: item.HardDiskDrive = null
+  var disk: item.Disk = null
 
   def init() {
     multi = new item.Delegator(Config.itemId)
 
     gpu = new item.GraphicsCard(multi)
     rs = new item.RedstoneCard(multi)
-
-    ram32k = new item.Memory(multi, 32)
-    ram64k = new item.Memory(multi, 64)
-    ram128k = new item.Memory(multi, 128)
-
-    hdd2 = new item.Hdd(multi, 2)
-    hdd4 = new item.Hdd(multi, 4)
-    hdd8 = new item.Hdd(multi, 8)
-
     lan = new item.NetworkCard(multi)
+
+    ram1 = new item.Memory(multi, 32)
+    ram2 = new item.Memory(multi, 64)
+    ram3 = new item.Memory(multi, 128)
+
+    hdd1 = new item.HardDiskDrive(multi, 2)
+    hdd2 = new item.HardDiskDrive(multi, 4)
+    hdd3 = new item.HardDiskDrive(multi, 8)
+    disk = new item.Disk(multi)
   }
 }

li/cil/oc/api/FileSystem.scala

@@ -209,10 +209,12 @@ trait FileSystem extends Persistable {
   def file(handle: Int): Option[Handle]
 
   /**
-   * Called when the file system is deconstructed.
+   * Called when the file system is close.
    * <p/>
-   * This should close any open real file handles (e.g. all open I/O streams)
-   * and clear any other internal state.
+   * This should close any open real file handles (e.g. all open I/O streams),
+   * but keep any internal state that may have to be persisted, for example
+   * for floppy disks (which are removed before they are saved so they don't
+   * save any open handles).
    * <p/>
    * When the filesystem is made available as a network node created via
    * `FileSystem.asNode` this will be called whenever the node is disconnected

li/cil/oc/api/driver/Item.scala

@@ -44,6 +44,7 @@ trait Item extends Driver {
    * driver supports may go. This will only be called if a previous call to
    * `worksWith` with the same item type returned true.
    *
+   * @param item the item to get the slot type for.
    * @return the component type of the specified item.
    */
   def slot(item: ItemStack): Slot.Value

li/cil/oc/api/driver/Memory.scala

@@ -0,0 +1,20 @@
+package li.cil.oc.api.driver
+
+import net.minecraft.item.ItemStack
+
+/**
+ * Use this trait to implement components extending the memory of a computer.
+ * <p/>
+ * Note that the item must be installed in the actual computer's inventory to
+ * work. If it is installed in an external inventory the computer will not
+ * recognize the memory.
+ */
+trait Memory extends Item {
+  /**
+   * The amount of RAM this component provides, in byte.
+   *
+   * @param item the item to get the provided memory for.
+   * @return the amount of memory the specified component provides.
+   */
+  def amount(item: ItemStack): Int
+}

li/cil/oc/api/driver/Slot.scala

@@ -8,8 +8,18 @@ package li.cil.oc.api.driver
  * inside the computer, not next to it.
  */
 object Slot extends Enumeration {
-  val PSU = Value("PSU")
-  val RAM = Value("RAM")
-  val HDD = Value("HDD")
-  val PCI = Value("PCI")
+  /** Power generating components, such as generators. */
+  val Power = Value("Power")
+
+  /** Memory extension components. */
+  val Memory = Value("Memory")
+
+  /** Hard disk drives. */
+  val HardDiskDrive = Value("HardDiskDrive")
+
+  /** Extension cards such as graphics or redstone cards. */
+  val Card = Value("Card")
+
+  /** Floppy disks. */
+  val Disk = Value("Disk")
 }

li/cil/oc/api/network/Node.scala

@@ -76,7 +76,7 @@ trait Node extends Persistable {
    * they have is to *not* have an address, which can be useful for "dummy"
    * nodes, such as cables. In that case they may ignore the address being set.
    */
-  var address: Option[String] = None
+  final var address: Option[String] = None
 
   /**
    * The network this node is currently in.
@@ -88,7 +88,7 @@ trait Node extends Persistable {
    * This will always be set automatically by the network manager. Do not
    * change this value and do not return anything that it wasn't set to.
    */
-  var network: Option[Network] = None
+  final var network: Option[Network] = None
 
   /**
    * Makes the node handle a message.
@@ -183,7 +183,7 @@ trait Node extends Persistable {
    * @param args the values to return.
    * @return and array option as required by `receive`.
    */
-  protected def result(args: Any*): Option[Array[Any]] = {
+  final protected def result(args: Any*): Option[Array[Any]] = {
     def unwrap(arg: Any): AnyRef = arg match {
       case x: ScalaNumber => x.underlying
       case x => x.asInstanceOf[AnyRef]

li/cil/oc/client/GuiHandler.scala

@@ -1,6 +1,6 @@
 package li.cil.oc.client
 
-import li.cil.oc.common.tileentity.{Screen, Computer}
+import li.cil.oc.common.tileentity
 import li.cil.oc.common.{GuiHandler => CommonGuiHandler, GuiType}
 import net.minecraft.entity.player.EntityPlayer
 import net.minecraft.world.World
@@ -8,10 +8,12 @@ import net.minecraft.world.World
 object GuiHandler extends CommonGuiHandler {
   override def getClientGuiElement(id: Int, player: EntityPlayer, world: World, x: Int, y: Int, z: Int) =
     world.getBlockTileEntity(x, y, z) match {
-      case tileEntity: Computer if id == GuiType.Computer.id =>
-        new gui.Computer(player.inventory, tileEntity)
-      case tileEntity: Screen if id == GuiType.Screen.id =>
-        new gui.Screen(tileEntity)
+      case computer: tileentity.Computer if id == GuiType.Computer.id =>
+        new gui.Computer(player.inventory, computer)
+      case screen: tileentity.Screen if id == GuiType.Screen.id =>
+        new gui.Screen(screen)
+      case drive: tileentity.DiskDrive if id == GuiType.DiskDrive.id =>
+        new gui.DiskDrive(player.inventory, drive)
       case _ => null
     }
 }

li/cil/oc/client/Proxy.scala

@@ -8,6 +8,7 @@ import cpw.mods.fml.relauncher.Side
 import li.cil.oc.OpenComputers
 import li.cil.oc.common.tileentity
 import li.cil.oc.common.{Proxy => CommonProxy}
+import li.cil.oc.client.renderer.tileentity.{PowerDistributorRenderer, ScreenRenderer, ComputerRenderer}
 
 private[oc] class Proxy extends CommonProxy {
   override def init(e: FMLInitializationEvent) = {

li/cil/oc/client/gui/Computer.scala

@@ -3,17 +3,11 @@ package li.cil.oc.client.gui
 import li.cil.oc.Config
 import li.cil.oc.common.container
 import li.cil.oc.common.tileentity
-import net.minecraft.client.gui.inventory.GuiContainer
-import net.minecraft.client.renderer.Tessellator
 import net.minecraft.entity.player.InventoryPlayer
 import net.minecraft.inventory.Slot
-import net.minecraft.util.ResourceLocation
-import net.minecraft.util.StatCollector
-import org.lwjgl.opengl.GL11
-
-class Computer(inventory: InventoryPlayer, val tileEntity: tileentity.Computer) extends GuiContainer(new container.Computer(inventory, tileEntity)) {
-  private val background = new ResourceLocation(Config.resourceDomain, "textures/gui/computer.png")
+import net.minecraft.util.{ResourceLocation, StatCollector}
 
+class Computer(playerInventory: InventoryPlayer, val computer: tileentity.Computer) extends DynamicGuiContainer(new container.Computer(playerInventory, computer)) {
   private val iconPsu = new ResourceLocation(Config.resourceDomain, "textures/gui/icon_psu.png")
   private val iconPci = new ResourceLocation(Config.resourceDomain, "textures/gui/icon_pci.png")
   private val iconRam = new ResourceLocation(Config.resourceDomain, "textures/gui/icon_ram.png")
@@ -21,52 +15,18 @@ class Computer(inventory: InventoryPlayer, val tileEntity: tileentity.Computer)
 
   private val icons = Array(iconPsu, iconPci, iconPci, iconPci, iconRam, iconRam, iconHdd, iconHdd)
 
-  private var (x, y) = (0, 0)
-
-  override def initGui() = {
-    super.initGui()
-    x = (width - xSize) / 2
-    y = (height - ySize) / 2
-  }
-
-  override def drawSlotInventory(slot: Slot) = {
-    super.drawSlotInventory(slot)
-    if (slot.slotNumber < 8 && !slot.getHasStack)
-      drawSlotIcon(slot, icons(slot.slotNumber))
-  }
-
   override def drawGuiContainerForegroundLayer(mouseX: Int, mouseY: Int) = {
     fontRenderer.drawString(
       StatCollector.translateToLocal("oc.container.computer"),
       8, 6, 0x404040)
-    fontRenderer.drawString(
-      StatCollector.translateToLocal("container.inventory"),
-      8, ySize - 96 + 2, 0x404040)
   }
 
-  override def drawGuiContainerBackgroundLayer(dt: Float, mouseX: Int, mouseY: Int) = {
-    GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F)
-    mc.renderEngine.bindTexture(background)
-    drawTexturedModalRect(x, y, 0, 0, xSize, ySize)
-  }
+  override protected def bindIconBackground(slot: Slot) =
+    if (slot.slotNumber < 8 && !slot.getHasStack) {
+      mc.renderEngine.bindTexture(icons(slot.slotNumber))
+      true
+    }
+    else false
 
   override def doesGuiPauseGame = false
-
-  private def drawSlotIcon(slot: Slot, icon: ResourceLocation) = {
-    GL11.glPushAttrib(0xFFFFFF)
-    GL11.glDisable(GL11.GL_LIGHTING)
-    GL11.glDisable(GL11.GL_DEPTH_TEST)
-    GL11.glEnable(GL11.GL_BLEND)
-    GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA)
-    GL11.glColor4f(1, 1, 1, 0.25f)
-    mc.renderEngine.bindTexture(icon)
-    val t = Tessellator.instance
-    t.startDrawingQuads()
-    t.addVertexWithUV(slot.xDisplayPosition, slot.yDisplayPosition + 16, zLevel, 0, 1)
-    t.addVertexWithUV(slot.xDisplayPosition + 16, slot.yDisplayPosition + 16, zLevel, 1, 1)
-    t.addVertexWithUV(slot.xDisplayPosition + 16, slot.yDisplayPosition, zLevel, 1, 0)
-    t.addVertexWithUV(slot.xDisplayPosition, slot.yDisplayPosition, zLevel, 0, 0)
-    t.draw()
-    GL11.glPopAttrib()
-  }
 }

li/cil/oc/client/gui/DiskDrive.scala

@@ -0,0 +1,14 @@
+package li.cil.oc.client.gui
+
+import li.cil.oc.common.container
+import li.cil.oc.common.tileentity
+import net.minecraft.entity.player.InventoryPlayer
+import net.minecraft.util.StatCollector
+
+class DiskDrive(playerInventory: InventoryPlayer, val drive: tileentity.DiskDrive) extends DynamicGuiContainer(new container.DiskDrive(playerInventory, drive)) {
+  override def drawGuiContainerForegroundLayer(mouseX: Int, mouseY: Int) = {
+    fontRenderer.drawString(
+      StatCollector.translateToLocal("oc.container.disk_drive"),
+      8, 6, 0x404040)
+  }
+}

li/cil/oc/client/gui/DynamicGuiContainer.scala

@@ -0,0 +1,65 @@
+package li.cil.oc.client.gui
+
+import li.cil.oc.Config
+import net.minecraft.client.gui.inventory.GuiContainer
+import net.minecraft.client.renderer.Tessellator
+import net.minecraft.inventory.{Container, Slot}
+import net.minecraft.util.{StatCollector, ResourceLocation}
+import org.lwjgl.opengl.GL11
+
+abstract class DynamicGuiContainer(container: Container) extends GuiContainer(container) {
+  protected val slotBackground = new ResourceLocation(Config.resourceDomain, "textures/gui/slot.png")
+  protected val background = new ResourceLocation(Config.resourceDomain, "textures/gui/background.png")
+
+  protected var (x, y) = (0, 0)
+
+  override def initGui() = {
+    super.initGui()
+    x = (width - xSize) / 2
+    y = (height - ySize) / 2
+  }
+
+  override def drawGuiContainerForegroundLayer(mouseX: Int, mouseY: Int) = {
+    fontRenderer.drawString(
+      StatCollector.translateToLocal("container.inventory"),
+      8, ySize - 96 + 2, 0x404040)
+  }
+
+  override def drawGuiContainerBackgroundLayer(dt: Float, mouseX: Int, mouseY: Int) = {
+    GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F)
+    mc.renderEngine.bindTexture(background)
+    drawTexturedModalRect(x, y, 0, 0, xSize, ySize)
+  }
+
+  override def drawSlotInventory(slot: Slot) = {
+    if (slot.slotNumber < container.inventorySlots.size() - 36) {
+      mc.renderEngine.bindTexture(slotBackground)
+      drawSlot(slot.xDisplayPosition - 1, slot.yDisplayPosition - 1, 18)
+    }
+    super.drawSlotInventory(slot)
+    if (bindIconBackground(slot))
+      drawSlot(slot.xDisplayPosition, slot.yDisplayPosition, 16, blend = true)
+  }
+
+  protected def bindIconBackground(slot: Slot) = false
+
+  private def drawSlot(x: Int, y: Int, size: Int, blend: Boolean = false) {
+    GL11.glPushAttrib(0xFFFFFF)
+    GL11.glDisable(GL11.GL_LIGHTING)
+    GL11.glDisable(GL11.GL_DEPTH_TEST)
+    if (blend) {
+      GL11.glEnable(GL11.GL_BLEND)
+      GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA)
+      GL11.glColor4f(1, 1, 1, 0.25f)
+    }
+    else GL11.glColor4f(1, 1, 1, 1)
+    val t = Tessellator.instance
+    t.startDrawingQuads()
+    t.addVertexWithUV(x, y + size, zLevel, 0, 1)
+    t.addVertexWithUV(x + size, y + size, zLevel, 1, 1)
+    t.addVertexWithUV(x + size, y, zLevel, 1, 0)
+    t.addVertexWithUV(x, y, zLevel, 0, 0)
+    t.draw()
+    GL11.glPopAttrib()
+  }
+}

li/cil/oc/client/renderer/tileentity/ComputerRenderer.scala

@@ -1,4 +1,4 @@
-package li.cil.oc.client
+package li.cil.oc.client.renderer.tileentity
 
 import li.cil.oc.Config
 import li.cil.oc.common.tileentity.Computer
@@ -8,6 +8,7 @@ import net.minecraft.tileentity.TileEntity
 import net.minecraft.util.ResourceLocation
 import net.minecraftforge.common.ForgeDirection
 import org.lwjgl.opengl.GL11
+import li.cil.oc.util.RenderState
 
 object ComputerRenderer extends TileEntitySpecialRenderer {
   private val frontOn = new ResourceLocation(Config.resourceDomain, "textures/blocks/computer_front_on.png")
@@ -17,8 +18,8 @@ object ComputerRenderer extends TileEntitySpecialRenderer {
     if (computer.isOn) {
       GL11.glPushAttrib(0xFFFFFF)
 
-      RenderUtil.disableLighting()
-      RenderUtil.makeItBlend()
+      RenderState.disableLighting()
+      RenderState.makeItBlend()
 
       GL11.glPushMatrix()
 

li/cil/oc/client/renderer/tileentity/PowerDistributorRenderer.scala

@@ -1,4 +1,4 @@
-package li.cil.oc.client
+package li.cil.oc.client.renderer.tileentity
 
 import li.cil.oc.Config
 import li.cil.oc.common.tileentity
@@ -7,6 +7,7 @@ import net.minecraft.client.renderer.tileentity.TileEntitySpecialRenderer
 import net.minecraft.tileentity.TileEntity
 import net.minecraft.util.ResourceLocation
 import org.lwjgl.opengl.GL11
+import li.cil.oc.util.RenderState
 
 object PowerDistributorRenderer extends TileEntitySpecialRenderer {
   private val sideOn = new ResourceLocation(Config.resourceDomain, "textures/blocks/power_distributor_on.png")
@@ -16,8 +17,8 @@ object PowerDistributorRenderer extends TileEntitySpecialRenderer {
     if (distributor.isActive) {
       GL11.glPushAttrib(0xFFFFFF)
 
-      RenderUtil.disableLighting()
-      RenderUtil.makeItBlend()
+      RenderState.disableLighting()
+      RenderState.makeItBlend()
 
       GL11.glPushMatrix()
 

li/cil/oc/client/renderer/tileentity/ScreenRenderer.scala

@@ -1,4 +1,4 @@
-package li.cil.oc.client
+package li.cil.oc.client.renderer.tileentity
 
 import com.google.common.cache.{CacheBuilder, RemovalNotification, RemovalListener}
 import cpw.mods.fml.common.{TickType, ITickHandler}
@@ -12,6 +12,7 @@ import net.minecraft.client.renderer.tileentity.TileEntitySpecialRenderer
 import net.minecraft.tileentity.TileEntity
 import net.minecraftforge.common.ForgeDirection
 import org.lwjgl.opengl.{GL14, GL11}
+import li.cil.oc.util.RenderState
 
 object ScreenRenderer extends TileEntitySpecialRenderer with Callable[Int] with RemovalListener[TileEntity, Int] with ITickHandler {
 
@@ -52,8 +53,8 @@ object ScreenRenderer extends TileEntitySpecialRenderer with Callable[Int] with
 
     GL11.glPushAttrib(0xFFFFFF)
 
-    RenderUtil.disableLighting()
-    RenderUtil.makeItBlend()
+    RenderState.disableLighting()
+    RenderState.makeItBlend()
 
     GL11.glPushMatrix()
 

li/cil/oc/common/GuiHandler.scala

@@ -1,15 +1,16 @@
 package li.cil.oc.common
 
 import cpw.mods.fml.common.network.IGuiHandler
-import li.cil.oc.common.tileentity.Computer
 import net.minecraft.entity.player.EntityPlayer
 import net.minecraft.world.World
 
 abstract class GuiHandler extends IGuiHandler {
   override def getServerGuiElement(id: Int, player: EntityPlayer, world: World, x: Int, y: Int, z: Int) =
     world.getBlockTileEntity(x, y, z) match {
-      case tileEntity: Computer =>
-        new container.Computer(player.inventory, tileEntity)
+      case computer: tileentity.Computer =>
+        new container.Computer(player.inventory, computer)
+      case drive: tileentity.DiskDrive =>
+        new container.DiskDrive(player.inventory, drive)
       case _ => null
     }
 }

li/cil/oc/common/GuiType.scala

@@ -3,4 +3,5 @@ package li.cil.oc.common
 object GuiType extends Enumeration {
   val Computer = Value("Computer")
   val Screen = Value("Screen")
+  val DiskDrive = Value("DiskDrive")
 }

li/cil/oc/common/block/Computer.scala

@@ -16,8 +16,6 @@ class Computer(val parent: Delegator) extends Delegate {
 
   val unlocalizedName = "Computer"
 
-  // ----------------------------------------------------------------------- //
-  // Rendering stuff
   // ----------------------------------------------------------------------- //
 
   private object Icons {
@@ -55,16 +53,12 @@ class Computer(val parent: Delegator) extends Delegate {
     Icons.on(ForgeDirection.EAST.ordinal) = Icons.on(ForgeDirection.WEST.ordinal)
   }
 
-  // ----------------------------------------------------------------------- //
-  // Tile entity
   // ----------------------------------------------------------------------- //
 
   override def hasTileEntity = true
 
   override def createTileEntity(world: World, metadata: Int) = Some(new tileentity.Computer(world.isRemote))
 
-  // ----------------------------------------------------------------------- //
-  // Destruction / Interaction
   // ----------------------------------------------------------------------- //
 
   override def canConnectRedstone(world: IBlockAccess, x: Int, y: Int, z: Int, side: ForgeDirection) =
@@ -77,8 +71,12 @@ class Computer(val parent: Delegator) extends Delegate {
     world.getBlockTileEntity(x, y, z).asInstanceOf[tileentity.Computer].output(side)
 
   override def breakBlock(world: World, x: Int, y: Int, z: Int, blockId: Int, metadata: Int) = {
-    if (!world.isRemote)
-      world.getBlockTileEntity(x, y, z).asInstanceOf[tileentity.Computer].turnOff()
+    if (!world.isRemote) world.getBlockTileEntity(x, y, z) match {
+      case computer: tileentity.Computer =>
+        computer.turnOff()
+        computer.dropContent(world, x, y, z)
+      case _ => // Ignore.
+    }
     super.breakBlock(world, x, y, z, blockId, metadata)
   }
 

li/cil/oc/common/block/Delegate.scala

@@ -13,9 +13,9 @@ import net.minecraftforge.common.ForgeDirection
 
 /** The base class on which all our blocks are built. */
 trait Delegate {
-  def parent: Delegator
+  val parent: Delegator
 
-  def unlocalizedName: String
+  val unlocalizedName: String
 
   val blockId = parent.add(this)
 

li/cil/oc/common/block/DiskDrive.scala

@@ -0,0 +1,57 @@
+package li.cil.oc.common.block
+
+import cpw.mods.fml.common.registry.GameRegistry
+import li.cil.oc.common.{GuiType, tileentity}
+import li.cil.oc.{OpenComputers, Config}
+import net.minecraft.client.renderer.texture.IconRegister
+import net.minecraft.entity.player.EntityPlayer
+import net.minecraft.util.Icon
+import net.minecraft.world.World
+import net.minecraftforge.common.ForgeDirection
+
+class DiskDrive(val parent: Delegator) extends Delegate {
+  GameRegistry.registerTileEntity(classOf[tileentity.DiskDrive], "oc.disk_drive")
+
+  val unlocalizedName = "DiskDrive"
+
+  // ----------------------------------------------------------------------- //
+
+  private val icons = Array.fill[Icon](6)(null)
+
+  override def icon(side: ForgeDirection) = Some(icons(side.ordinal))
+
+  override def registerIcons(iconRegister: IconRegister) = {
+    icons(ForgeDirection.DOWN.ordinal) = iconRegister.registerIcon(Config.resourceDomain + ":computer_top")
+    icons(ForgeDirection.UP.ordinal) = icons(ForgeDirection.DOWN.ordinal)
+
+    icons(ForgeDirection.NORTH.ordinal) = iconRegister.registerIcon(Config.resourceDomain + ":disk_drive_side")
+    icons(ForgeDirection.SOUTH.ordinal) = iconRegister.registerIcon(Config.resourceDomain + ":disk_drive_front")
+    icons(ForgeDirection.WEST.ordinal) = icons(ForgeDirection.NORTH.ordinal)
+    icons(ForgeDirection.EAST.ordinal) = icons(ForgeDirection.NORTH.ordinal)
+  }
+
+  // ----------------------------------------------------------------------- //
+
+  override def hasTileEntity = true
+
+  override def createTileEntity(world: World, metadata: Int) = Some(new tileentity.DiskDrive)
+
+  // ----------------------------------------------------------------------- //
+
+  override def breakBlock(world: World, x: Int, y: Int, z: Int, blockId: Int, metadata: Int) = {
+    if (!world.isRemote) world.getBlockTileEntity(x, y, z) match {
+      case drive: tileentity.DiskDrive => drive.dropContent(world, x, y, z)
+      case _ => // Ignore.
+    }
+    super.breakBlock(world, x, y, z, blockId, metadata)
+  }
+
+  override def onBlockActivated(world: World, x: Int, y: Int, z: Int, player: EntityPlayer,
+                                side: ForgeDirection, hitX: Float, hitY: Float, hitZ: Float) = {
+    if (!player.isSneaking) {
+      player.openGui(OpenComputers, GuiType.DiskDrive.id, world, x, y, z)
+      true
+    }
+    else false
+  }
+}

li/cil/oc/common/container/DiskDrive.scala

@@ -0,0 +1,18 @@
+package li.cil.oc.common.container
+
+import li.cil.oc.common.tileentity
+import net.minecraft.entity.player.InventoryPlayer
+import net.minecraft.inventory.Slot
+import net.minecraft.item.ItemStack
+
+class DiskDrive(playerInventory: InventoryPlayer, drive: tileentity.DiskDrive) extends Player(playerInventory, drive) {
+  // Floppy slot.
+  addSlotToContainer(new Slot(drive, 0, 80, 35) {
+    override def isItemValid(item: ItemStack) = {
+      drive.isItemValidForSlot(0, item)
+    }
+  })
+
+  // Show the player's inventory.
+  addPlayerInventorySlots(8, 84)
+}

li/cil/oc/common/item/Delegate.scala

@@ -7,9 +7,9 @@ import net.minecraft.util.Icon
 import net.minecraft.world.World
 
 trait Delegate {
-  def parent: Delegator
+  val parent: Delegator
 
-  def unlocalizedName: String
+  val unlocalizedName: String
 
   val itemId = parent.add(this)
 
@@ -23,7 +23,7 @@ trait Delegate {
 
   def icon: Option[Icon] = _icon
 
-  protected def icon_=(value: Icon) = _icon = Some(value)
+  protected def icon_=(value: Icon) = _icon = Option(value)
 
   def onItemRightClick(item: ItemStack, world: World, player: EntityPlayer): ItemStack = item
 

li/cil/oc/common/item/Disk.scala

@@ -0,0 +1,14 @@
+package li.cil.oc.common.item
+
+import li.cil.oc.Config
+import net.minecraft.client.renderer.texture.IconRegister
+
+class Disk(val parent: Delegator) extends Delegate {
+  val unlocalizedName = "Disk"
+
+  override def registerIcons(iconRegister: IconRegister) {
+    super.registerIcons(iconRegister)
+
+    icon = iconRegister.registerIcon(Config.resourceDomain + ":disk")
+  }
+}

li/cil/oc/common/item/GraphicsCard.scala

@@ -4,7 +4,7 @@ import li.cil.oc.Config
 import net.minecraft.client.renderer.texture.IconRegister
 
 class GraphicsCard(val parent: Delegator) extends Delegate {
-  def unlocalizedName = "GraphicsCard"
+  val unlocalizedName = "GraphicsCard"
 
   override def registerIcons(iconRegister: IconRegister) {
     super.registerIcons(iconRegister)

li/cil/oc/common/item/HardDiskDrive.scala

@@ -6,8 +6,8 @@ import net.minecraft.client.renderer.texture.IconRegister
 import net.minecraft.entity.player.EntityPlayer
 import net.minecraft.item.ItemStack
 
-class Hdd(val parent: Delegator, val megaBytes: Int) extends Delegate {
-  def unlocalizedName = "HardDiskDrive" + megaBytes + "m"
+class HardDiskDrive(val parent: Delegator, val megaBytes: Int) extends Delegate {
+  val unlocalizedName = "HardDiskDrive" + megaBytes + "m"
 
   override def addInformation(item: ItemStack, player: EntityPlayer, tooltip: util.List[String], advanced: Boolean) = {
     super.addInformation(item, player, tooltip, advanced)

li/cil/oc/common/item/Memory.scala

@@ -4,7 +4,7 @@ import li.cil.oc.Config
 import net.minecraft.client.renderer.texture.IconRegister
 
 class Memory(val parent: Delegator, val kiloBytes: Int) extends Delegate {
-  def unlocalizedName = "Memory" + kiloBytes + "k"
+  val unlocalizedName = "Memory" + kiloBytes + "k"
 
   override def registerIcons(iconRegister: IconRegister) {
     super.registerIcons(iconRegister)

li/cil/oc/common/item/NetworkCard.scala

@@ -4,7 +4,7 @@ import li.cil.oc.Config
 import net.minecraft.client.renderer.texture.IconRegister
 
 class NetworkCard(val parent: Delegator) extends Delegate {
-  def unlocalizedName = "NetworkCard"
+  val unlocalizedName = "NetworkCard"
 
   override def registerIcons(iconRegister: IconRegister) = {
     super.registerIcons(iconRegister)

li/cil/oc/common/item/RedstoneCard.scala

@@ -4,7 +4,7 @@ import li.cil.oc.Config
 import net.minecraft.client.renderer.texture.IconRegister
 
 class RedstoneCard(val parent: Delegator) extends Delegate {
-  def unlocalizedName = "RedstoneCard"
+  val unlocalizedName = "RedstoneCard"
 
   override def registerIcons(iconRegister: IconRegister) {
     super.registerIcons(iconRegister)

li/cil/oc/common/tileentity/Adapter.scala

@@ -6,6 +6,7 @@ import li.cil.oc.api.network.{Message, Visibility, Node}
 import li.cil.oc.server.driver
 import net.minecraftforge.common.ForgeDirection
 import scala.collection.mutable
+import net.minecraft.nbt.NBTTagCompound
 
 class Adapter extends Rotatable with Node with IPeripheral {
   val name = "adapter"
@@ -71,6 +72,19 @@ class Adapter extends Rotatable with Node with IPeripheral {
     }
   }
 
+  override def readFromNBT(nbt: NBTTagCompound) {
+    super.readFromNBT(nbt)
+    load(nbt.getCompoundTag("node"))
+  }
+
+  override def writeToNBT(nbt: NBTTagCompound) {
+    super.writeToNBT(nbt)
+
+    val nodeNbt = new NBTTagCompound
+    save(nodeNbt)
+    nbt.setCompoundTag("node", nodeNbt)
+  }
+
   // ----------------------------------------------------------------------- //
 
   override def getType = "oc_adapter"

li/cil/oc/common/tileentity/ComponentInventory.scala

@@ -1,33 +1,23 @@
 package li.cil.oc.common.tileentity
 
-import li.cil.oc.Items
-import li.cil.oc.api.driver.Slot
-import li.cil.oc.api.network.{PoweredNode, Node}
-import li.cil.oc.common.item
-import li.cil.oc.server.component
+import li.cil.oc.api.driver
+import li.cil.oc.api.network.Node
 import li.cil.oc.server.driver.Registry
-import net.minecraft.inventory.IInventory
 import net.minecraft.item.ItemStack
 import net.minecraft.nbt.NBTTagCompound
 import net.minecraft.nbt.NBTTagList
 import net.minecraft.world.World
 
-trait ComponentInventory extends IInventory with PoweredNode {
-  protected val inventory = new Array[ItemStack](inventorySize)
-
-  protected val itemComponents = Array.fill[Option[Node]](inventorySize)(None)
-
-  protected val computer: component.Computer
+trait ComponentInventory extends Inventory with Node {
+  protected val components = Array.fill[Option[Node]](getSizeInventory)(None)
 
   def world: World
 
-  def inventorySize = 8
-
   // ----------------------------------------------------------------------- //
 
-  def installedMemory = inventory.foldLeft(0)((sum, stack) => sum + (Registry.driverFor(stack) match {
-    case Some(driver) if driver.slot(stack) == Slot.RAM => Items.multi.subItem(stack) match {
-      case Some(ram: item.Memory) => ram.kiloBytes * 1024
+  def installedMemory = inventory.foldLeft(0)((sum, stack) => sum + (stack match {
+    case Some(item) => Registry.driverFor(item) match {
+      case Some(driver: driver.Memory) => driver.amount(item)
       case _ => 0
     }
     case _ => 0
@@ -37,14 +27,16 @@ trait ComponentInventory extends IInventory with PoweredNode {
 
   override protected def onConnect() {
     super.onConnect()
-    for (node <- itemComponents.filter(_.isDefined).map(_.get))
-      network.foreach(_.connect(this, node))
+    components collect {
+      case Some(node) => network.foreach(_.connect(this, node))
+    }
   }
 
   override protected def onDisconnect() {
     super.onDisconnect()
-    for (node <- itemComponents.filter(_.isDefined).map(_.get))
-      node.network.foreach(_.remove(node))
+    components collect {
+      case Some(node) => node.network.foreach(_.remove(node))
+    }
   }
 
   // ----------------------------------------------------------------------- //
@@ -56,32 +48,37 @@ trait ComponentInventory extends IInventory with PoweredNode {
       val slotNbt = list.tagAt(i).asInstanceOf[NBTTagCompound]
       val slot = slotNbt.getByte("slot")
       if (slot >= 0 && slot < inventory.length) {
-        inventory(slot) = ItemStack.loadItemStackFromNBT(
-          slotNbt.getCompoundTag("item"))
-        itemComponents(slot) = Registry.driverFor(inventory(slot)) match {
-          case None => None
-          case Some(driver) => driver.node(inventory(slot))
+        val item = ItemStack.loadItemStackFromNBT(slotNbt.getCompoundTag("item"))
+        inventory(slot) = Some(item)
+        components(slot) = Registry.driverFor(item) match {
+          case Some(driver) =>
+            driver.node(item) match {
+              case Some(node) =>
+                node.load(driver.nbt(item))
+                Some(node)
+              case _ => None
+            }
+          case _ => None
         }
       }
     }
-    computer.recomputeMemory()
   }
 
   override def save(nbt: NBTTagCompound) = {
     super.save(nbt)
     val list = new NBTTagList
-    inventory.zipWithIndex filter {
-      case (stack, slot) => stack != null
+    inventory.zipWithIndex collect {
+      case (Some(stack), slot) => (stack, slot)
     } foreach {
       case (stack, slot) => {
         val slotNbt = new NBTTagCompound
         slotNbt.setByte("slot", slot.toByte)
 
-        itemComponents(slot) match {
-          case None => // Nothing special to save.
+        components(slot) match {
           case Some(node) =>
             // We're guaranteed to have a driver for entries.
             node.save(Registry.driverFor(stack).get.nbt(stack))
+          case _ => // Nothing special to save.
         }
 
         val itemNbt = new NBTTagCompound
@@ -97,75 +94,27 @@ trait ComponentInventory extends IInventory with PoweredNode {
 
   def getInventoryStackLimit = 1
 
-  def getInvName = "oc.container.computer"
-
-  def getSizeInventory = inventory.length
-
-  def getStackInSlot(i: Int) = inventory(i)
-
-  def decrStackSize(slot: Int, amount: Int) = {
-    val stack = getStackInSlot(slot)
-    val result = if (stack == null)
-      null
-    else if (stack.stackSize <= amount) {
-      setInventorySlotContents(slot, null)
-      stack
-    }
-    else {
-      val subStack = stack.splitStack(amount)
-      if (stack.stackSize == 0) {
-        setInventorySlotContents(slot, null)
+  override protected def onItemAdded(slot: Int, item: ItemStack) = if (!world.isRemote) {
+    Registry.driverFor(item) match {
+      case None => // No driver.
+      case Some(driver) => driver.node(item) match {
+        case None => // No node.
+        case Some(node) =>
+          components(slot) = Some(node)
+          node.load(driver.nbt(item))
+          network.foreach(_.connect(this, node))
       }
-      subStack
     }
-    onInventoryChanged()
-    result
   }
 
-  def getStackInSlotOnClosing(slot: Int) = null
-
-  def setInventorySlotContents(slot: Int, item: ItemStack) = {
+  override protected def onItemRemoved(slot: Int, item: ItemStack) = if (!world.isRemote) {
     // Uninstall component previously in that slot.
-    if (!world.isRemote) itemComponents(slot) match {
-      case None => // Nothing to do.
+    components(slot) match {
       case Some(node) =>
-        itemComponents(slot) = None
+        components(slot) = None
         node.network.foreach(_.remove(node))
-        node.save(Registry.driverFor(inventory(slot)).get.nbt(inventory(slot)))
+        Registry.driverFor(item).foreach(driver => node.save(driver.nbt(item)))
+      case _ => // Nothing to do.
     }
-
-    inventory(slot) = item
-    if (item != null && item.stackSize > getInventoryStackLimit)
-      item.stackSize = getInventoryStackLimit
-
-    if (!world.isRemote) {
-      Registry.driverFor(inventory(slot)) match {
-        case None => // No driver.
-        case Some(driver) =>
-          driver.node(inventory(slot)) match {
-            case None => // No node.
-            case Some(node) =>
-              itemComponents(slot) = Some(node)
-              network.foreach(_.connect(this, node))
-          }
-      }
-    }
-
-    onInventoryChanged()
   }
-
-  def isItemValidForSlot(slot: Int, item: ItemStack) = (slot, Registry.driverFor(item)) match {
-    case (_, None) => false // Invalid item.
-    case (0, Some(driver)) => driver.slot(item) == Slot.PSU
-    case (1 | 2 | 3, Some(driver)) => driver.slot(item) == Slot.PCI
-    case (4 | 5, Some(driver)) => driver.slot(item) == Slot.RAM
-    case (6 | 7, Some(driver)) => driver.slot(item) == Slot.HDD
-    case _ => false // Invalid slot.
-  }
-
-  def isInvNameLocalized = false
-
-  def openChest() {}
-
-  def closeChest() {}
 }

li/cil/oc/common/tileentity/Computer.scala

@@ -1,16 +1,20 @@
 package li.cil.oc.common.tileentity
 
 import java.util.concurrent.atomic.AtomicBoolean
+import li.cil.oc.api.driver.Slot
+import li.cil.oc.api.network.PoweredNode
 import li.cil.oc.client.{PacketSender => ClientPacketSender}
 import li.cil.oc.server.component
 import li.cil.oc.server.component.Redstone
 import li.cil.oc.server.driver
+import li.cil.oc.server.driver.Registry
 import li.cil.oc.server.{PacketSender => ServerPacketSender}
 import net.minecraft.entity.player.EntityPlayer
+import net.minecraft.item.ItemStack
 import net.minecraft.nbt.NBTTagCompound
 import net.minecraftforge.common.ForgeDirection
 
-class Computer(isClient: Boolean) extends Rotatable with component.Computer.Environment with ComponentInventory with Redstone {
+class Computer(isClient: Boolean) extends Rotatable with component.Computer.Environment with ComponentInventory with Redstone with PoweredNode {
   def this() = this(false)
 
   // ----------------------------------------------------------------------- //
@@ -45,15 +49,16 @@ class Computer(isClient: Boolean) extends Rotatable with component.Computer.Envi
 
   override def readFromNBT(nbt: NBTTagCompound) = {
     super.readFromNBT(nbt)
-    load(nbt.getCompoundTag("data"))
+    load(nbt.getCompoundTag("node"))
+    computer.recomputeMemory()
   }
 
   override def writeToNBT(nbt: NBTTagCompound) = {
     super.writeToNBT(nbt)
 
-    val dataNbt = new NBTTagCompound
-    save(dataNbt)
-    nbt.setCompoundTag("data", dataNbt)
+    val nodeNbt = new NBTTagCompound
+    save(nodeNbt)
+    nbt.setCompoundTag("node", nodeNbt)
   }
 
   // ----------------------------------------------------------------------- //
@@ -67,7 +72,7 @@ class Computer(isClient: Boolean) extends Rotatable with component.Computer.Envi
       ServerPacketSender.sendComputerState(this, computer.isRunning)
     isRunning = computer.isRunning
 
-    for (component <- itemComponents) component match {
+    for (component <- components) component match {
       case Some(node) => node.update()
       case _ => // Empty.
     }
@@ -83,6 +88,19 @@ class Computer(isClient: Boolean) extends Rotatable with component.Computer.Envi
 
   // ----------------------------------------------------------------------- //
 
+  def getInvName = "oc.container.computer"
+
+  def getSizeInventory = 8
+
+  def isItemValidForSlot(slot: Int, item: ItemStack) = (slot, Registry.driverFor(item)) match {
+    case (_, None) => false // Invalid item.
+    case (0, Some(driver)) => driver.slot(item) == Slot.Power
+    case (1 | 2 | 3, Some(driver)) => driver.slot(item) == Slot.Card
+    case (4 | 5, Some(driver)) => driver.slot(item) == Slot.Memory
+    case (6 | 7, Some(driver)) => driver.slot(item) == Slot.HardDiskDrive
+    case _ => false // Invalid slot.
+  }
+
   override def isUseableByPlayer(player: EntityPlayer) =
     worldObj.getBlockTileEntity(xCoord, yCoord, zCoord) == this &&
       player.getDistanceSq(xCoord + 0.5, yCoord + 0.5, zCoord + 0.5) < 64
@@ -118,6 +136,8 @@ class Computer(isClient: Boolean) extends Rotatable with component.Computer.Envi
     else worldObj.markBlockForRenderUpdate(xCoord, yCoord, zCoord)
   }
 
-  private def hasRedstoneCard =
-    !inventory.isEmpty && inventory.exists(item => item != null && driver.RedstoneCard.worksWith(item))
+  private def hasRedstoneCard = inventory.exists {
+    case Some(item) => driver.RedstoneCard.worksWith(item)
+    case _ => false
+  }
 }

li/cil/oc/common/tileentity/DiskDrive.scala

@@ -0,0 +1,57 @@
+package li.cil.oc.common.tileentity
+
+import li.cil.oc.api.driver.Slot
+import li.cil.oc.api.network.{Message, Visibility, Node}
+import li.cil.oc.server.driver.Registry
+import net.minecraft.entity.player.EntityPlayer
+import net.minecraft.item.ItemStack
+import net.minecraft.nbt.NBTTagCompound
+
+class DiskDrive extends Rotatable with Node with ComponentInventory {
+  val name = "disk_drive"
+
+  val visibility = Visibility.Network
+
+  def world = worldObj
+
+  // ----------------------------------------------------------------------- //
+
+  override def receive(message: Message) = super.receive(message) orElse {
+    components(0) match {
+      case Some(node) if node.address.isDefined =>
+        node.receive(message)
+      case _ if message.name.startsWith("fs.") => result(Unit, "no disk")
+      case _ => None
+    }
+  }
+
+  // ----------------------------------------------------------------------- //
+
+  override def readFromNBT(nbt: NBTTagCompound) {
+    super.readFromNBT(nbt)
+    load(nbt.getCompoundTag("node"))
+  }
+
+  override def writeToNBT(nbt: NBTTagCompound) {
+    super.writeToNBT(nbt)
+
+    val nodeNbt = new NBTTagCompound
+    save(nodeNbt)
+    nbt.setCompoundTag("node", nodeNbt)
+  }
+
+  // ----------------------------------------------------------------------- //
+
+  def getInvName = "oc.container.disk_drive"
+
+  def getSizeInventory = 1
+
+  def isItemValidForSlot(slot: Int, item: ItemStack) = (slot, Registry.driverFor(item)) match {
+    case (0, Some(driver)) => driver.slot(item) == Slot.Disk
+    case _ => false
+  }
+
+  def isUseableByPlayer(player: EntityPlayer) =
+    worldObj.getBlockTileEntity(xCoord, yCoord, zCoord) == this &&
+      player.getDistanceSq(xCoord + 0.5, yCoord + 0.5, zCoord + 0.5) < 64
+}

li/cil/oc/common/tileentity/Inventory.scala

@@ -0,0 +1,66 @@
+package li.cil.oc.common.tileentity
+
+import net.minecraft.entity.item.EntityItem
+import net.minecraft.inventory.IInventory
+import net.minecraft.item.ItemStack
+import net.minecraft.world.World
+
+trait Inventory extends IInventory {
+  protected val inventory = Array.fill[Option[ItemStack]](getSizeInventory)(None)
+
+  def getStackInSlot(i: Int) = inventory(i).orNull
+
+  def decrStackSize(slot: Int, amount: Int) = inventory(slot) match {
+    case Some(stack) if stack.stackSize <= amount =>
+      setInventorySlotContents(slot, null)
+      stack
+    case Some(stack) =>
+      val result = stack.splitStack(amount)
+      onInventoryChanged()
+      result
+    case _ => null
+  }
+
+  def setInventorySlotContents(slot: Int, item: ItemStack) = {
+    if (inventory(slot).isDefined)
+      onItemRemoved(slot, inventory(slot).get)
+
+    inventory(slot) = Option(item)
+    if (item != null && item.stackSize > getInventoryStackLimit)
+      item.stackSize = getInventoryStackLimit
+
+    if (inventory(slot).isDefined)
+      onItemAdded(slot, inventory(slot).get)
+
+    onInventoryChanged()
+  }
+
+  def getStackInSlotOnClosing(slot: Int) = null
+
+  def isInvNameLocalized = false
+
+  def openChest() {}
+
+  def closeChest() {}
+
+  def dropContent(world: World, x: Int, y: Int, z: Int) {
+    val rng = world.rand
+    for (slot <- 0 until getSizeInventory) {
+      inventory(slot) match {
+        case Some(stack) if stack.stackSize > 0 =>
+          setInventorySlotContents(slot, null)
+          val (tx, ty, tz) = (0.25 + (rng.nextDouble() * 0.5), 0.25 + (rng.nextDouble() * 0.5), 0.25 + (rng.nextDouble() * 0.5))
+          val (vx, vy, vz) = ((rng.nextDouble() - 0.3) * 0.5, (rng.nextDouble() - 0.5) * 0.3, (rng.nextDouble() - 0.5) * 0.3)
+          val entity = new EntityItem(world, x + tx, y + ty, z + tz, stack.copy())
+          entity.setVelocity(vx, vy, vz)
+          entity.delayBeforeCanPickup = 20
+          world.spawnEntityInWorld(entity)
+        case _ => // Nothing.
+      }
+    }
+  }
+
+  protected def onItemAdded(slot: Int, item: ItemStack) {}
+
+  protected def onItemRemoved(slot: Int, item: ItemStack) {}
+}

li/cil/oc/common/tileentity/Keyboard.scala

@@ -28,15 +28,15 @@ class Keyboard extends Rotatable with Node {
 
   override def readFromNBT(nbt: NBTTagCompound) {
     super.readFromNBT(nbt)
-    load(nbt.getCompoundTag("data"))
+    load(nbt.getCompoundTag("node"))
   }
 
   override def writeToNBT(nbt: NBTTagCompound) {
     super.writeToNBT(nbt)
 
-    val dataNbt = new NBTTagCompound
-    save(dataNbt)
-    nbt.setCompoundTag("data", dataNbt)
+    val nodeNbt = new NBTTagCompound
+    save(nodeNbt)
+    nbt.setCompoundTag("node", nodeNbt)
   }
 
   def isUseableByPlayer(p: Player) = worldObj.getBlockTileEntity(xCoord, yCoord, zCoord) == this &&

li/cil/oc/common/tileentity/Screen.scala

@@ -15,15 +15,15 @@ class Screen extends Rotatable with ScreenEnvironment with PoweredNode {
 
   override def readFromNBT(nbt: NBTTagCompound) = {
     super.readFromNBT(nbt)
-    load(nbt.getCompoundTag("data"))
+    load(nbt.getCompoundTag("node"))
   }
 
   override def writeToNBT(nbt: NBTTagCompound) = {
     super.writeToNBT(nbt)
 
-    val dataNbt = new NBTTagCompound
-    save(dataNbt)
-    nbt.setCompoundTag("data", dataNbt)
+    val nodeNbt = new NBTTagCompound
+    save(nodeNbt)
+    nbt.setCompoundTag("node", nodeNbt)
   }
 
   override def validate() = {

li/cil/oc/server/driver/FileSystem.scala

@@ -2,34 +2,43 @@ package li.cil.oc.server.driver
 
 import li.cil.oc
 import li.cil.oc.api.driver.{Item, Slot}
-import li.cil.oc.common.item.Hdd
+import li.cil.oc.common.item.{Disk, HardDiskDrive}
 import li.cil.oc.{Config, Items}
 import net.minecraft.item.ItemStack
+import net.minecraft.nbt.NBTTagCompound
 
 object FileSystem extends Item {
   override def api = Option(getClass.getResourceAsStream(Config.driverPath + "filesystem.lua"))
 
-  override def worksWith(item: ItemStack) = WorksWith(Items.hdd2, Items.hdd4, Items.hdd8)(item)
+  override def worksWith(item: ItemStack) = WorksWith(Items.hdd1, Items.hdd2, Items.hdd3, Items.disk)(item)
 
-  override def slot(item: ItemStack) = Slot.HDD
+  override def slot(item: ItemStack) = Items.multi.subItem(item) match {
+    case Some(hdd: HardDiskDrive) => Slot.HardDiskDrive
+    case Some(disk: Disk) => Slot.Disk
+    case _ => throw new IllegalArgumentException()
+  }
 
   override def node(item: ItemStack) = Items.multi.subItem(item) match {
-    case Some(subItem: Hdd) =>
-      // We have a bit of a chicken-egg problem here, because we want to use the
-      // node's address as the folder name... so we generate the address here,
-      // if necessary. No one will know, right? Right!?
-      val tag = nbt(item)
-      val address =
-        if (tag.hasKey("address")) tag.getString("address")
-        else java.util.UUID.randomUUID().toString
-      oc.api.FileSystem.fromSaveDirectory(address, subItem.megaBytes * 1024 * 1024, Config.filesBuffered).
-        flatMap(oc.api.FileSystem.asNode) match {
-        case None => None
-        case Some(node) =>
-          node.address = Some(address)
-          node.load(tag)
-          Some(node)
-      }
+    case Some(hdd: HardDiskDrive) => createNode(item, hdd.megaBytes * 1024 * 1024)
+    case Some(disk: Disk) => createNode(item, 512 * 1024)
     case _ => None
   }
+
+  private def createNode(item: ItemStack, capacity: Int) = {
+    // We have a bit of a chicken-egg problem here, because we want to use the
+    // node's address as the folder name... so we generate the address here,
+    // if necessary. No one will know, right? Right!?
+    val address = addressFromTag(nbt(item))
+    oc.api.FileSystem.fromSaveDirectory(address, capacity, Config.filesBuffered).
+      flatMap(oc.api.FileSystem.asNode) match {
+      case Some(node) =>
+        node.address = Some(address)
+        Some(node)
+      case None => None
+    }
+  }
+
+  private def addressFromTag(tag: NBTTagCompound) =
+    if (tag.hasKey("address")) tag.getString("address")
+    else java.util.UUID.randomUUID().toString
 }

li/cil/oc/server/driver/GraphicsCard.scala

@@ -11,11 +11,7 @@ object GraphicsCard extends driver.Item {
 
   override def worksWith(item: ItemStack) = WorksWith(Items.gpu)(item)
 
-  override def slot(item: ItemStack) = Slot.PCI
+  override def slot(item: ItemStack) = Slot.Card
 
-  override def node(item: ItemStack) = {
-    val instance = new component.GraphicsCard()
-    instance.load(nbt(item))
-    Some(instance)
-  }
+  override def node(item: ItemStack) = Some(new component.GraphicsCard())
 }

li/cil/oc/server/driver/Memory.scala

@@ -5,8 +5,13 @@ import li.cil.oc.api.driver
 import li.cil.oc.api.driver.Slot
 import net.minecraft.item.ItemStack
 
-object Memory extends driver.Item {
-  override def worksWith(item: ItemStack) = WorksWith(Items.ram128k, Items.ram32k, Items.ram64k)(item)
+object Memory extends driver.Memory {
+  override def amount(item: ItemStack) = if (item.itemID == Items.multi.itemID) Items.multi.subItem(item) match {
+    case Some(memory: li.cil.oc.common.item.Memory) => memory.kiloBytes * 1024
+    case _ => 0
+  } else 0
 
-  override def slot(item: ItemStack) = Slot.RAM
+  override def worksWith(item: ItemStack) = WorksWith(Items.ram3, Items.ram1, Items.ram2)(item)
+
+  override def slot(item: ItemStack) = Slot.Memory
 }

li/cil/oc/server/driver/NetworkCard.scala

@@ -11,11 +11,7 @@ object NetworkCard extends driver.Item {
 
   def worksWith(item: ItemStack) = WorksWith(Items.lan)(item)
 
-  def slot(item: ItemStack) = Slot.PCI
+  def slot(item: ItemStack) = Slot.Card
 
-  override def node(item: ItemStack) = {
-    val instance = new component.NetworkCard()
-    instance.load(nbt(item))
-    Some(instance)
-  }
+  override def node(item: ItemStack) = Some(new component.NetworkCard())
 }

li/cil/oc/server/driver/RedstoneCard.scala

@@ -11,11 +11,7 @@ object RedstoneCard extends driver.Item {
 
   override def worksWith(item: ItemStack) = WorksWith(Items.rs)(item)
 
-  override def slot(item: ItemStack) = Slot.PCI
+  override def slot(item: ItemStack) = Slot.Card
 
-  override def node(item: ItemStack) = {
-    val instance = new component.RedstoneCard()
-    instance.load(nbt(item))
-    Some(instance)
-  }
+  override def node(item: ItemStack) = Some(new component.RedstoneCard())
 }

li/cil/oc/server/fs/VirtualFileSystem.scala

@@ -95,13 +95,6 @@ trait VirtualFileSystem extends OutputStreamFileSystem {
 
   // ----------------------------------------------------------------------- //
 
-  override def close() = {
-    super.close()
-    root.children.clear()
-  }
-
-  // ----------------------------------------------------------------------- //
-
   override protected def openInputStream(path: String) =
     root.get(segments(path)) match {
       case Some(obj: VirtualFile) => obj.openInputStream()

li/cil/oc/util/LuaStateFactory.scala

@@ -99,7 +99,7 @@ object LuaStateFactory {
   // ----------------------------------------------------------------------- //
 
   def createState(): Option[LuaState] = {
-    val state = new LuaState(Integer.MAX_VALUE)
+    val state = new LuaState(Int.MaxValue)
     try {
       // Load all libraries.
       state.openLib(LuaState.Library.BASE)

li/cil/oc/util/RenderState.scala

@@ -1,9 +1,9 @@
-package li.cil.oc.client
+package li.cil.oc.util
 
 import net.minecraft.client.renderer.OpenGlHelper
 import org.lwjgl.opengl.{ARBMultitexture, GLContext, GL11, GL13}
 
-object RenderUtil {
+object RenderState {
   val arb = GLContext.getCapabilities.GL_ARB_multitexture && !GLContext.getCapabilities.OpenGL13
 
   def disableLighting() {