diff --git a/assets/opencomputers/lua/drivers/network.lua b/assets/opencomputers/lua/drivers/network.lua
index 74eac0783..22608290c 100644
--- a/assets/opencomputers/lua/drivers/network.lua
+++ b/assets/opencomputers/lua/drivers/network.lua
@@ -1,6 +1,12 @@
 driver.network = {}
 
 function driver.network.open(card, port)
+  checkArg(1, card, "string")
+  checkArg(2, port, "number")
+  return send(card, "network.open=", port)
+end
+
+function driver.network.isOpen(card, port)
   checkArg(1, card, "string")
   checkArg(2, port, "number")
   return send(card, "network.open", port)
@@ -8,8 +14,12 @@ end
 
 function driver.network.close(card, port)
   checkArg(1, card, "string")
-  checkArg(2, port, "number")
-  return send(card, "network.close", port)
+  if port then
+    checkArg(2, port, "number")
+    return send(card, "network.close", port)
+  else
+    return send(card, "network.close")
+  end
 end
 
 function driver.network.send(card, target, port, ...)
diff --git a/li/cil/oc/api/network/Node.scala b/li/cil/oc/api/network/Node.scala
index 8cc77cd70..2e8cf5f03 100644
--- a/li/cil/oc/api/network/Node.scala
+++ b/li/cil/oc/api/network/Node.scala
@@ -114,6 +114,20 @@ trait Node extends Persistable {
     None
   }
 
+  /**
+   * This is called once per tick, if the node is owned either by a computer
+   * (meaning it's an item component installed in a computer) or is managed by
+   * an adapter (meaning it was acquired via a block driver for a block whose
+   * tile entity is not a node).
+   * <p/>
+   * For nodes implemented directly in tile entities you should just call this
+   * from the tile entity's `updateEntity` function yourself, as necessary.
+   * <p/>
+   * When implementing an "inventory", i.e. something that holds item
+   * components, be sure to call `update` for the installed components' nodes.
+   */
+  def update() {}
+
   // ----------------------------------------------------------------------- //
 
   /**
diff --git a/li/cil/oc/common/tileentity/Adapter.scala b/li/cil/oc/common/tileentity/Adapter.scala
index 9d9c7328d..e5647b736 100644
--- a/li/cil/oc/common/tileentity/Adapter.scala
+++ b/li/cil/oc/common/tileentity/Adapter.scala
@@ -1,17 +1,41 @@
 package li.cil.oc.common.tileentity
 
+import dan200.computer.api.{ILuaContext, IComputerAccess, IPeripheral}
 import li.cil.oc.api
-import li.cil.oc.api.network.{Visibility, Node}
+import li.cil.oc.api.network.{Message, Visibility, Node}
 import li.cil.oc.server.driver
 import net.minecraftforge.common.ForgeDirection
+import scala.collection.mutable
 
-class Adapter extends Rotatable with Node {
+class Adapter extends Rotatable with Node with IPeripheral {
   val name = "adapter"
 
   val visibility = Visibility.None
 
   private val blocks = Array.fill[Option[(Node, api.driver.Block)]](6)(None)
 
+  private val computers = mutable.ArrayBuffer.empty[IComputerAccess]
+
+  private val openPorts = mutable.Map.empty[IComputerAccess, mutable.Set[Int]]
+
+  override def updateEntity() {
+    for (block <- blocks) block match {
+      case Some((node, driver)) => node.update()
+      case _ => // Empty.
+    }
+  }
+
+  override def receive(message: Message) = super.receive(message) orElse {
+    message.data match {
+      case Array(port: Int, answerPort: Double, data: AnyRef) if message.name == "network.message" =>
+        for ((computer, ports) <- openPorts) if (ports.contains(port)) {
+          computer.queueEvent("modem_message", Array(computer.getAttachmentName, Int.box(port), Int.box(answerPort.toInt), data))
+        }
+      case _ => // Ignore.
+    }
+    None
+  }
+
   override protected def onConnect() {
     super.onConnect()
     neighborChanged()
@@ -46,4 +70,55 @@ class Adapter extends Rotatable with Node {
       }
     }
   }
+
+  // ----------------------------------------------------------------------- //
+
+  override def getType = "oc_adapter"
+
+  override def attach(computer: IComputerAccess) {
+    computers += computer
+    openPorts += computer -> mutable.Set.empty
+  }
+
+  override def detach(computer: IComputerAccess) {
+    computers -= computer
+    openPorts -= computer
+  }
+
+  override def getMethodNames = Array("open", "isOpen", "close", "closeAll", "transmit", "isWireless")
+
+  override def callMethod(computer: IComputerAccess, context: ILuaContext, method: Int, arguments: Array[AnyRef]) = getMethodNames()(method) match {
+    case "open" =>
+      val port = parsePort(arguments, 0)
+      if (openPorts(computer).size >= 128)
+        throw new IllegalArgumentException("too many open channels")
+      Array(Boolean.box(openPorts(computer).add(port)))
+    case "isOpen" =>
+      val port = parsePort(arguments, 0)
+      Array(Boolean.box(openPorts(computer).contains(port)))
+    case "close" =>
+      val port = parsePort(arguments, 0)
+      Array(Boolean.box(openPorts(computer).remove(port)))
+    case "closeAll" =>
+      openPorts(computer).clear()
+      null
+    case "transmit" =>
+      val sendPort = parsePort(arguments, 0)
+      val answerPort = parsePort(arguments, 1)
+      network.foreach(_.sendToVisible(this, "network.message", sendPort, answerPort, arguments(2)))
+      null
+    case "isWireless" => Array(Boolean.box(false))
+    case _ => null
+  }
+
+  override def canAttachToSide(side: Int) = true
+
+  private def parsePort(args: Array[AnyRef], index: Int) = {
+    if (args.length < index - 1 || !args(index).isInstanceOf[Int])
+      throw new IllegalArgumentException("bad argument #%d (number expected)".format(index))
+    val port = args(index).asInstanceOf[Int]
+    if (port < 1 || port > 0xFFFF)
+      throw new IllegalArgumentException("bad argument #%d (number in [1, 65535] expected)".format(index))
+    port
+  }
 }
diff --git a/li/cil/oc/common/tileentity/Computer.scala b/li/cil/oc/common/tileentity/Computer.scala
index c267a23af..9510a2cba 100644
--- a/li/cil/oc/common/tileentity/Computer.scala
+++ b/li/cil/oc/common/tileentity/Computer.scala
@@ -60,11 +60,17 @@ class Computer(isClient: Boolean) extends Rotatable with component.Computer.Envi
 
   override def updateEntity() = if (!worldObj.isRemote) {
     computer.update()
+
     if (hasChanged.get)
       worldObj.markTileEntityChunkModified(xCoord, yCoord, zCoord, this)
     if (isRunning != computer.isRunning)
       ServerPacketSender.sendComputerState(this, computer.isRunning)
     isRunning = computer.isRunning
+
+    for (component <- itemComponents) component match {
+      case Some(node) => node.update()
+      case _ => // Empty.
+    }
   }
 
   override def validate() = {
diff --git a/li/cil/oc/server/component/NetworkCard.scala b/li/cil/oc/server/component/NetworkCard.scala
index bae156329..4d84905e6 100644
--- a/li/cil/oc/server/component/NetworkCard.scala
+++ b/li/cil/oc/server/component/NetworkCard.scala
@@ -20,12 +20,18 @@ class NetworkCard extends Node {
           openPorts.clear()
         None
 
-      case Array(port: Double) if message.name == "network.open" =>
+      case Array(port: Double) if message.name == "network.open=" =>
         if (isPortValid(port.toInt)) result(openPorts.add(port.toInt))
         else result(Unit, "invalid port number")
+      case Array(port: Double) if message.name == "network.open" =>
+        if (isPortValid(port.toInt)) result(openPorts.contains(port.toInt))
+        else result(Unit, "invalid port number")
       case Array(port: Double) if message.name == "network.close" =>
         if (isPortValid(port.toInt)) result(openPorts.remove(port.toInt))
         else result(Unit, "invalid port number")
+      case Array() if message.name == "network.close" =>
+        openPorts.clear()
+        result(true)
       case Array(address: Array[Byte], port: Double, args@_*) if message.name == "network.send" =>
         if (isPortValid(port.toInt))
           network.get.sendToAddress(this, new String(address, "UTF-8"), "network.message", Seq(port.toInt) ++ args: _*)