diff --git a/src/main/java/com/loomcom/symon/machines/MulticompMachine.java b/src/main/java/com/loomcom/symon/machines/MulticompMachine.java
index 0150e58..e7349de 100644
--- a/src/main/java/com/loomcom/symon/machines/MulticompMachine.java
+++ b/src/main/java/com/loomcom/symon/machines/MulticompMachine.java
@@ -73,7 +73,7 @@ public class MulticompMachine implements Machine {
 
         bus.addCpu(cpu);
         bus.addDevice(ram);
-        bus.addDevice(acia);
+        bus.addDevice(acia, true);
         
         // TODO: Make this configurable, of course.
         File romImage = new File("rom.bin");