diff --git a/src/main/java/de/neemann/digital/core/memory/RAMSinglePortSel.java b/src/main/java/de/neemann/digital/core/memory/RAMSinglePortSel.java
index b5e261730..21e52f51d 100644
--- a/src/main/java/de/neemann/digital/core/memory/RAMSinglePortSel.java
+++ b/src/main/java/de/neemann/digital/core/memory/RAMSinglePortSel.java
@@ -26,9 +26,9 @@ public class RAMSinglePortSel extends Node implements Element, RAMInterface {
 
     public static final ElementTypeDescription DESCRIPTION = new ElementTypeDescription(RAMSinglePortSel.class,
             input("A"),
-            input("sel"),
-            input("C"),
-            input("W/\u00ACR"))
+            input("CS"),
+            input("WE"),
+            input("OE"))
             .addAttribute(Keys.ROTATE)
             .addAttribute(Keys.BITS)
             .addAttribute(Keys.ADDR_BITS)
@@ -41,15 +41,14 @@ public class RAMSinglePortSel extends Node implements Element, RAMInterface {
     private final String label;
     private final ObservableValue dataOut;
     private ObservableValue addrIn;
-    private ObservableValue selIn;
-    private ObservableValue clkIn;
-    private ObservableValue wnrIn;
+    private ObservableValue csIn;
+    private ObservableValue weIn;
+    private ObservableValue oeIn;
     private ObservableValue dataIn;
 
-    private boolean lastClk = false;
-    private boolean sel;
+    private boolean cs;
     private int addr;
-    private boolean write;
+    private boolean oe;
 
     /**
      * Creates a new instance
@@ -69,30 +68,28 @@ public class RAMSinglePortSel extends Node implements Element, RAMInterface {
     @Override
     public void setInputs(ObservableValues inputs) throws NodeException {
         addrIn = inputs.get(0).checkBits(addrBits, this).addObserverToValue(this);
-        selIn = inputs.get(1).checkBits(1, this).addObserverToValue(this);
-        clkIn = inputs.get(2).checkBits(1, this).addObserverToValue(this);
-        wnrIn = inputs.get(3).checkBits(1, this).addObserverToValue(this);
+        csIn = inputs.get(1).checkBits(1, this).addObserverToValue(this);
+        weIn = inputs.get(2).checkBits(1, this).addObserverToValue(this);
+        oeIn = inputs.get(3).checkBits(1, this).addObserverToValue(this);
         dataIn = inputs.get(4).checkBits(bits, this).addObserverToValue(this);
     }
 
     @Override
     public void readInputs() throws NodeException {
-        boolean clk = clkIn.getBool();
-        sel = selIn.getBool();
-        if (sel) {
+        cs = csIn.getBool();
+        if (cs) {
             addr = (int) addrIn.getValue();
-            write = wnrIn.getBool();
-            if (write && !lastClk && clk) {
+            oe = oeIn.getBool();
+            if (weIn.getBool()) {
                 long data = dataIn.getValue();
                 memory.setData(addr, data);
             }
         }
-        lastClk = clk;
     }
 
     @Override
     public void writeOutputs() throws NodeException {
-        if (sel && !write) {
+        if (cs && oe) {
             dataOut.set(memory.getDataWord(addr), false);
         } else {
             dataOut.setHighZ(true);
diff --git a/src/test/java/de/neemann/digital/integration/FileScanner.java b/src/test/java/de/neemann/digital/integration/FileScanner.java
index e451d9314..b90a8b482 100644
--- a/src/test/java/de/neemann/digital/integration/FileScanner.java
+++ b/src/test/java/de/neemann/digital/integration/FileScanner.java
@@ -19,6 +19,7 @@ public class FileScanner {
     public int scan(File path) throws Exception {
         errors = new ArrayList<>();
         int count = scanIntern(path);
+        System.out.println("tested "+count+" examples");
         if (errors.isEmpty())
             return count;
 
diff --git a/src/test/resources/dig/test/ram.dig b/src/test/resources/dig/test/ram.dig
index 7def20901..f8aa14fc0 100644
--- a/src/test/resources/dig/test/ram.dig
+++ b/src/test/resources/dig/test/ram.dig
@@ -14,7 +14,7 @@
           <int>6</int>
         </entry>
       </elementAttributes>
-      <pos x="40" y="380"/>
+      <pos x="60" y="380"/>
     </visualElement>
     <visualElement>
       <elementName>Out</elementName>
@@ -71,20 +71,20 @@
       <elementAttributes>
         <entry>
           <string>Label</string>
-          <string>C</string>
+          <string>WE</string>
         </entry>
       </elementAttributes>
-      <pos x="120" y="440"/>
+      <pos x="60" y="440"/>
     </visualElement>
     <visualElement>
       <elementName>In</elementName>
       <elementAttributes>
         <entry>
           <string>Label</string>
-          <string>W</string>
+          <string>OE</string>
         </entry>
       </elementAttributes>
-      <pos x="40" y="460"/>
+      <pos x="60" y="480"/>
     </visualElement>
     <visualElement>
       <elementName>RAMSinglePortSel</elementName>
@@ -148,35 +148,35 @@
         <entry>
           <string>Testdata</string>
           <testData>
-            <dataString>sel A C W Din Dout
+            <dataString>CS A WE OE Din Dout
 
 # write some values
- 1  0 C 1 7   X
- 1 10 C 1 8   X
- 1 20 C 1 9   X
- 1 30 C 1 10  X
- 1 40 C 1 11  X
- 1 50 C 1 12  X
- 1 60 C 1 13  X
+ 1  0 C 0 7   X
+ 1 10 C 0 8   X
+ 1 20 C 0 9   X
+ 1 30 C 0 10  X
+ 1 40 C 0 11  X
+ 1 50 C 0 12  X
+ 1 60 C 0 13  X
 
 # read some values
- 1  0 0 0 Z   7
- 1 10 0 0 Z   8   
- 1 20 0 0 Z   9   
- 1 30 0 0 Z   10  
- 1 40 0 0 Z   11  
- 1 50 0 0 Z   12  
- 1 60 0 0 Z   13  
+ 1  0 0 1 Z   7
+ 1 10 0 1 Z   8   
+ 1 20 0 1 Z   9   
+ 1 30 0 1 Z   10  
+ 1 40 0 1 Z   11  
+ 1 50 0 1 Z   12  
+ 1 60 0 1 Z   13  
 
-# read with sel=0 does not work
+# read with CS=0 does not work
  0 50 0 0 Z   Z  
  0 60 0 0 Z   Z  
 
-# write with sel=0 does not work
- 0  1 C 1 7   X
- 0  2 C 1 7   X
- 1  1 0 0 Z   0
- 1  2 0 0 Z   0   
+# write with CS=0 does not work
+ 0  1 C 0 7   X
+ 0  2 C 0 7   X
+ 1  1 0 1 Z   0
+ 1  2 0 1 Z   0   
 </dataString>
           </testData>
         </entry>
@@ -202,10 +202,10 @@
       <elementAttributes>
         <entry>
           <string>Label</string>
-          <string>sel</string>
+          <string>CS</string>
         </entry>
       </elementAttributes>
-      <pos x="40" y="620"/>
+      <pos x="60" y="620"/>
     </visualElement>
   </visualElements>
   <wires>
@@ -217,6 +217,10 @@
       <p1 x="180" y="640"/>
       <p2 x="200" y="640"/>
     </wire>
+    <wire>
+      <p1 x="60" y="480"/>
+      <p2 x="260" y="480"/>
+    </wire>
     <wire>
       <p1 x="380" y="420"/>
       <p2 x="400" y="420"/>
@@ -249,10 +253,6 @@
       <p1 x="220" y="680"/>
       <p2 x="320" y="680"/>
     </wire>
-    <wire>
-      <p1 x="40" y="460"/>
-      <p2 x="260" y="460"/>
-    </wire>
     <wire>
       <p1 x="260" y="460"/>
       <p2 x="320" y="460"/>
@@ -262,7 +262,7 @@
       <p2 x="220" y="620"/>
     </wire>
     <wire>
-      <p1 x="40" y="620"/>
+      <p1 x="60" y="620"/>
       <p2 x="140" y="620"/>
     </wire>
     <wire>
@@ -298,7 +298,7 @@
       <p2 x="320" y="820"/>
     </wire>
     <wire>
-      <p1 x="120" y="440"/>
+      <p1 x="60" y="440"/>
       <p2 x="280" y="440"/>
     </wire>
     <wire>
@@ -318,7 +318,7 @@
       <p2 x="300" y="380"/>
     </wire>
     <wire>
-      <p1 x="40" y="380"/>
+      <p1 x="60" y="380"/>
       <p2 x="120" y="380"/>
     </wire>
     <wire>
@@ -355,12 +355,16 @@
     </wire>
     <wire>
       <p1 x="260" y="460"/>
-      <p2 x="260" y="600"/>
+      <p2 x="260" y="480"/>
     </wire>
     <wire>
       <p1 x="260" y="600"/>
       <p2 x="260" y="740"/>
     </wire>
+    <wire>
+      <p1 x="260" y="480"/>
+      <p2 x="260" y="600"/>
+    </wire>
     <wire>
       <p1 x="260" y="740"/>
       <p2 x="260" y="880"/>