diff --git a/src/main/java/de/neemann/digital/gui/draw/shapes/GenericShape.java b/src/main/java/de/neemann/digital/gui/draw/shapes/GenericShape.java
index 6fc1d8c6b..9c79f0ded 100644
--- a/src/main/java/de/neemann/digital/gui/draw/shapes/GenericShape.java
+++ b/src/main/java/de/neemann/digital/gui/draw/shapes/GenericShape.java
@@ -31,9 +31,9 @@ public class GenericShape implements Shape {
         if (pins == null) {
             pins = new ArrayList<>(inputs + outputs);
             for (int i = 0; i < inputs; i++)
-                pins.add(new Pin(new Vector(0, i * SIZE), "i" + i));
+                pins.add(new Pin(new Vector(0, i * SIZE), "i" + i, Pin.Direction.input));
             for (int i = 0; i < outputs; i++)
-                pins.add(new Pin(new Vector(SIZE * 3, i * SIZE), "o" + i));
+                pins.add(new Pin(new Vector(SIZE * 3, i * SIZE), "o" + i, Pin.Direction.output));
         }
         return pins;
     }
diff --git a/sun_checks_neemann.xml b/sun_checks_neemann.xml
new file mode 100644
index 000000000..16760dd62
--- /dev/null
+++ b/sun_checks_neemann.xml
@@ -0,0 +1,207 @@
+<?xml version="1.0"?>
+<!DOCTYPE module PUBLIC
+        "-//Puppy Crawl//DTD Check Configuration 1.2//EN"
+        "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">
+
+<!--
+
+  Checkstyle configuration that checks the sun coding conventions from:
+
+    - the Java Language Specification at
+      http://java.sun.com/docs/books/jls/second_edition/html/index.html
+
+    - the Sun Code Conventions at http://java.sun.com/docs/codeconv/
+
+    - the Javadoc guidelines at
+      http://java.sun.com/j2se/javadoc/writingdoccomments/index.html
+
+    - the JDK Api documentation http://java.sun.com/j2se/docs/api/index.html
+
+    - some best practices
+
+  Checkstyle is very configurable. Be sure to read the documentation at
+  http://checkstyle.sf.net (or in your downloaded distribution).
+
+  Most Checks are configurable, be sure to consult the documentation.
+
+  To completely disable a check, just comment it out or delete it from the file.
+
+  Finally, it is worth reading the documentation.
+
+-->
+
+<module name="Checker">
+    <!--
+        If you set the basedir property below, then all reported file
+        names will be relative to the specified directory. See
+        http://checkstyle.sourceforge.net/5.x/config.html#Checker
+
+        <property name="basedir" value="${basedir}"/>
+    -->
+
+    <!-- Checks that a package-info.java file exists for each package.     -->
+    <!-- See http://checkstyle.sf.net/config_javadoc.html#JavadocPackage -->
+    <module name="JavadocPackage"/>
+
+    <!-- Checks whether files end with a new line.                        -->
+    <!-- See http://checkstyle.sf.net/config_misc.html#NewlineAtEndOfFile -->
+    <module name="NewlineAtEndOfFile"/>
+
+    <!-- Checks that property files contain the same keys.         -->
+    <!-- See http://checkstyle.sf.net/config_misc.html#Translation -->
+    <module name="Translation"/>
+
+    <!-- Checks for Size Violations.                    -->
+    <!-- See http://checkstyle.sf.net/config_sizes.html -->
+    <module name="FileLength"/>
+
+    <!-- Checks for whitespace                               -->
+    <!-- See http://checkstyle.sf.net/config_whitespace.html -->
+    <module name="FileTabCharacter"/>
+
+    <!-- Miscellaneous other checks.                   -->
+    <!-- See http://checkstyle.sf.net/config_misc.html -->
+    <module name="RegexpSingleline">
+        <property name="format" value="\s+$"/>
+        <property name="minimum" value="0"/>
+        <property name="maximum" value="0"/>
+        <property name="message" value="Line has trailing spaces."/>
+    </module>
+
+    <module name="TreeWalker">
+
+        <!-- Checks for Javadoc comments.                     -->
+        <!-- See http://checkstyle.sf.net/config_javadoc.html -->
+        <module name="JavadocMethod">
+            <property name="scope" value="protected"/>
+            <property name="allowUndeclaredRTE" value="true"/>
+            <property name="allowMissingParamTags" value="true"/>
+        </module>
+        <module name="JavadocType">
+            <property name="scope" value="public"/>
+        </module>
+        <module name="JavadocVariable">
+            <property name="scope" value="public"/>
+        </module>
+        <module name="JavadocStyle">
+            <property name="checkFirstSentence" value="false"/>
+        </module>
+
+
+        <!-- Checks for Naming Conventions.                  -->
+        <!-- See http://checkstyle.sf.net/config_naming.html -->
+        <module name="ConstantName"/>
+        <module name="LocalFinalVariableName"/>
+        <module name="LocalVariableName"/>
+        <module name="MemberName"/>
+        <module name="MethodName"/>
+        <module name="PackageName"/>
+        <module name="ParameterName"/>
+        <module name="StaticVariableName"/>
+        <module name="TypeName"/>
+
+
+        <!-- Checks for Headers                                -->
+        <!-- See http://checkstyle.sf.net/config_header.html   -->
+        <!-- <module name="Header">                            -->
+        <!-- The follow property value demonstrates the ability     -->
+        <!-- to have access to ANT properties. In this case it uses -->
+        <!-- the ${basedir} property to allow Checkstyle to be run  -->
+        <!-- from any directory within a project. See property      -->
+        <!-- expansion,                                             -->
+        <!-- http://checkstyle.sf.net/config.html#properties        -->
+        <!-- <property                                              -->
+        <!--     name="headerFile"                                  -->
+        <!--     value="${basedir}/java.header"/>                   -->
+        <!-- </module> -->
+
+        <!-- Following interprets the header file as regular expressions. -->
+        <!-- <module name="RegexpHeader"/>                                -->
+
+
+        <!-- Checks for imports                              -->
+        <!-- See http://checkstyle.sf.net/config_import.html -->
+        <!--module name="AvoidStarImport"/-->
+        <module name="IllegalImport"/>
+        <!-- defaults to sun.* packages -->
+        <module name="RedundantImport"/>
+        <module name="UnusedImports"/>
+
+
+        <!-- Checks for Size Violations.                    -->
+        <!-- See http://checkstyle.sf.net/config_sizes.html -->
+        <!--module name="LineLength"/-->
+        <module name="MethodLength"/>
+        <module name="ParameterNumber"/>
+
+
+        <!-- Checks for whitespace                               -->
+        <!-- See http://checkstyle.sf.net/config_whitespace.html -->
+        <module name="EmptyForIteratorPad"/>
+        <module name="GenericWhitespace"/>
+        <module name="MethodParamPad"/>
+        <module name="NoWhitespaceAfter"/>
+        <module name="NoWhitespaceBefore"/>
+        <module name="OperatorWrap"/>
+        <module name="ParenPad"/>
+        <module name="TypecastParenPad"/>
+        <module name="WhitespaceAfter"/>
+        <!--module name="WhitespaceAround"/-->
+
+
+        <!-- Modifier Checks                                    -->
+        <!-- See http://checkstyle.sf.net/config_modifiers.html -->
+        <!--module name="ModifierOrder"/-->
+        <module name="RedundantModifier"/>
+
+
+        <!-- Checks for blocks. You know, those {}'s         -->
+        <!-- See http://checkstyle.sf.net/config_blocks.html -->
+        <module name="AvoidNestedBlocks"/>
+        <module name="EmptyBlock"/>
+        <module name="LeftCurly"/>
+        <!--module name="NeedBraces"/-->
+        <module name="RightCurly"/>
+
+
+        <!-- Checks for common coding problems               -->
+        <!-- See http://checkstyle.sf.net/config_coding.html -->
+        <module name="AvoidInlineConditionals"/>
+        <module name="EmptyStatement"/>
+        <module name="EqualsHashCode"/>
+        <!--module name="HiddenField"/-->
+        <!--module name="FinalLocalVariable"/-->
+        <module name="IllegalInstantiation"/>
+        <module name="InnerAssignment"/>
+        <!--module name="MagicNumber">
+            <property name="tokens" value="NUM_INT, NUM_LONG"/>
+            <property name="ignoreHashCodeMethod" value="true"/>
+        </module-->
+        <module name="MissingSwitchDefault"/>
+        <module name="ModifiedControlVariable"/>
+        <module name="SimplifyBooleanExpression"/>
+        <module name="SimplifyBooleanReturn"/>
+        <module name="StringLiteralEquality"/>
+        <!--module name="MultipleStringLiterals"/-->
+        <module name="MultipleVariableDeclarations"/>
+        <module name="OverloadMethodsDeclarationOrder"/>
+
+        <!-- Checks for class design                         -->
+        <!-- See http://checkstyle.sf.net/config_design.html -->
+        <!--module name="DesignForExtension"/-->
+        <module name="FinalClass"/>
+        <module name="HideUtilityClassConstructor"/>
+        <module name="InterfaceIsType"/>
+        <module name="VisibilityModifier"/>
+
+
+        <!-- Miscellaneous other checks.                   -->
+        <!-- See http://checkstyle.sf.net/config_misc.html -->
+        <module name="ArrayTypeStyle"/>
+        <!--module name="FinalParameters"/-->
+        <module name="TodoComment"/>
+        <module name="UpperEll"/>
+
+    </module>
+
+</module>