diff --git a/src/main/java/de/neemann/digital/core/extern/handler/StdIOProcess.java b/src/main/java/de/neemann/digital/core/extern/handler/StdIOProcess.java
index 4a7417f90..e87c5e878 100644
--- a/src/main/java/de/neemann/digital/core/extern/handler/StdIOProcess.java
+++ b/src/main/java/de/neemann/digital/core/extern/handler/StdIOProcess.java
@@ -8,6 +8,7 @@ package de.neemann.digital.core.extern.handler;
 import de.neemann.digital.core.ObservableValue;
 import de.neemann.digital.core.ObservableValues;
 import de.neemann.digital.core.extern.ProcessHandler;
+import de.neemann.digital.lang.Lang;
 
 import java.io.*;
 
@@ -85,7 +86,7 @@ public class StdIOProcess implements ProcessHandler {
                     lock.wait(1000);
 
                 if (dataFound == null)
-                    throw new IOException("timeout");
+                    throw new IOException(Lang.get("err_timeoutReadingData"));
 
                 String line = dataFound;
                 dataFound = null;
@@ -131,7 +132,7 @@ public class StdIOProcess implements ProcessHandler {
                 final int bits = v.getBits();
 
                 if (pos + bits > len)
-                    throw new IOException("not enough data");
+                    throw new IOException(Lang.get("err_notEnoughDataReceived"));
 
                 long value = 0;
                 long highZ = 0;
@@ -153,7 +154,7 @@ public class StdIOProcess implements ProcessHandler {
                         case '0':
                             break;
                         default:
-                            throw new IOException("invalid character " + c);
+                            throw new IOException(Lang.get("err_invalidCharacterReceived_N", "" + c));
                     }
                     mask <<= 1;
                     pos++;
@@ -161,7 +162,7 @@ public class StdIOProcess implements ProcessHandler {
                 v.set(value, highZ);
             }
         } else
-            throw new IOException("process has stopped");
+            throw new IOException(Lang.get("err_processTerminatedUnexpected"));
     }
 
     @Override
@@ -173,10 +174,10 @@ public class StdIOProcess implements ProcessHandler {
         try {
             thread.join(1000);
         } catch (InterruptedException e) {
-            throw new IOException("thread was interrupted");
+            // its ok, I just want to terminate the process!
         }
 
         if (thread.isAlive())
-            throw new IOException("thread was not stopped");
+            throw new IOException(Lang.get("err_couldNotTerminateProcess"));
     }
 }
diff --git a/src/main/resources/lang/lang_de.xml b/src/main/resources/lang/lang_de.xml
index b42a585f4..c0aea3fab 100644
--- a/src/main/resources/lang/lang_de.xml
+++ b/src/main/resources/lang/lang_de.xml
@@ -844,6 +844,11 @@ Sind evtl. die Namen der Variablen nicht eindeutig?</string>
     <string name="err_errorWritingDataToProcess">Es konnten keine Werte an den externen Prozess übergeben werden!</string>
     <string name="err_errorReadingDataToProcess">Es konnten keine Werte vom externen Prozess gelesen werden!</string>
     <string name="err_errorCreatingProcess">Der externe Prozess konnte nicht gestartet werden!</string>
+    <string name="err_timeoutReadingData">Zeitüberschreitung beim Lesen von Daten!</string>
+    <string name="err_notEnoughDataReceived">Es wurden nicht genug Daten empfangen!</string>
+    <string name="err_invalidCharacterReceived_N">Der empfangene Text enthielt ein ungültiges Zeichen: {0}!</string>
+    <string name="err_processTerminatedUnexpected">Der Prozess wurde unerwartet beendet!</string>
+    <string name="err_couldNotTerminateProcess">Der Prozess konnte nicht beendet werden!</string>
 
     <string name="key_AddrBits">Adress-Bits</string><!-- ROM, RAMDualPort, RAMSinglePort, RAMSinglePortSel, EEPROM -->
     <string name="key_AddrBits_tt">Anzahl der Adress-Bits, die verwendet werden.</string>
diff --git a/src/main/resources/lang/lang_en.xml b/src/main/resources/lang/lang_en.xml
index 56abf7acc..e2cb55dbf 100644
--- a/src/main/resources/lang/lang_en.xml
+++ b/src/main/resources/lang/lang_en.xml
@@ -839,6 +839,11 @@ The names of the variables may not be unique.</string>
     <string name="err_errorWritingDataToProcess">Could not write values to the external process!</string>
     <string name="err_errorReadingDataToProcess">Could not write values from the external process!</string>
     <string name="err_errorCreatingProcess">Could not create the external process!</string>
+    <string name="err_timeoutReadingData">Timeout reading data from external process!</string>
+    <string name="err_notEnoughDataReceived">Not enough data received!</string>
+    <string name="err_invalidCharacterReceived_N">The received text contains an invalid character: {0}!</string>
+    <string name="err_processTerminatedUnexpected">The process has terminated unexpected!</string>
+    <string name="err_couldNotTerminateProcess">Could not terminate the process!</string>
 
     <string name="key_AddrBits">Address Bits</string><!-- ROM, RAMDualPort, RAMSinglePort, RAMSinglePortSel, EEPROM -->
     <string name="key_AddrBits_tt">Number of address bits used.</string>