diff --git a/Platform/Apple/tools/jace/src/main/java/jace/assembly/AcmeCompiler.java b/Platform/Apple/tools/jace/src/main/java/jace/assembly/AcmeCompiler.java
index a25ef1da..f2aade4b 100644
--- a/Platform/Apple/tools/jace/src/main/java/jace/assembly/AcmeCompiler.java
+++ b/Platform/Apple/tools/jace/src/main/java/jace/assembly/AcmeCompiler.java
@@ -7,6 +7,8 @@ import java.io.File;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.io.PrintStream;
+import java.nio.ByteBuffer;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.LinkedHashMap;
@@ -20,10 +22,10 @@ import java.util.stream.Collectors;
  *
  * @author blurry
  */
-public class AcmeCompiler implements CompileResult<File> {
+public class AcmeCompiler implements CompileResult<ByteBuffer> {
 
     boolean successful = false;
-    File compiledAsset = null;
+    ByteBuffer compiledAsset = null;
     Map<Integer, String> errors = new LinkedHashMap<>();
     Map<Integer, String> warnings = new LinkedHashMap<>();
     List<String> otherWarnings = new ArrayList<>();
@@ -35,7 +37,7 @@ public class AcmeCompiler implements CompileResult<File> {
     }
 
     @Override
-    public File getCompiledAsset() {
+    public ByteBuffer getCompiledAsset() {
         return compiledAsset;
     }
 
@@ -100,21 +102,26 @@ public class AcmeCompiler implements CompileResult<File> {
     
     private void invokeAcme(File sourceFile, File workingDirectory) throws ClassNotFoundException, SecurityException, NoSuchMethodException, IOException {
         String oldPath = System.getProperty("user.dir");
+        File tempFile = null;
         redirectSystemOutput();
         try {
-            compiledAsset = File.createTempFile(sourceFile.getName(), "bin", sourceFile.getParentFile());
+            tempFile = File.createTempFile(sourceFile.getName(), "bin", sourceFile.getParentFile());
+            tempFile.deleteOnExit();
             System.setProperty("user.dir", workingDirectory.getAbsolutePath());
             AcmeCrossAssembler acme = new AcmeCrossAssembler();
-            String[] params = {"--outfile", normalizeWindowsPath(compiledAsset.getAbsolutePath()), "-f", "cbm", "--maxerrors","16",normalizeWindowsPath(sourceFile.getAbsolutePath())};
+            String[] params = {"--outfile", normalizeWindowsPath(tempFile.getAbsolutePath()), "-f", "cbm", "--maxerrors","16",normalizeWindowsPath(sourceFile.getAbsolutePath())};
             int status = acme.run("Acme", params);
             successful = status == 0;
-            if (!successful) {
-                compiledAsset.delete();
-                compiledAsset = null;
+            if (successful) {
+                compiledAsset = ByteBuffer.wrap(Files.readAllBytes(tempFile.toPath()));
             }
+            tempFile.delete();
         } finally {
             restoreSystemOutput();
             System.setProperty("user.dir", oldPath);
+            if (tempFile != null && tempFile.exists()) {
+                tempFile.delete();
+            }
         }
         rawOutput.add("Error output:");
         extractOutput(baosErr.toString());
diff --git a/Platform/Apple/tools/jace/src/main/java/jace/assembly/AssemblyHandler.java b/Platform/Apple/tools/jace/src/main/java/jace/assembly/AssemblyHandler.java
index bd62aa60..1bae21d7 100644
--- a/Platform/Apple/tools/jace/src/main/java/jace/assembly/AssemblyHandler.java
+++ b/Platform/Apple/tools/jace/src/main/java/jace/assembly/AssemblyHandler.java
@@ -3,6 +3,7 @@ package jace.assembly;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
+import java.nio.ByteBuffer;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
@@ -17,14 +18,14 @@ import jace.ide.Program;
  *
  * @author blurry
  */
-public class AssemblyHandler implements LanguageHandler<File> {
+public class AssemblyHandler implements LanguageHandler<ByteBuffer> {
     @Override
     public String getNewDocumentContent() {
         return "\t\t*= $300;\n\t\t!cpu 65c02;\n;--- Insert your code here ---\n";
     }    
 
     @Override
-    public CompileResult<File> compile(Program proxy) {
+    public CompileResult<ByteBuffer> compile(Program proxy) {
         AcmeCompiler compiler = new AcmeCompiler();
         compiler.compile(proxy);
         return compiler;
@@ -34,69 +35,51 @@ public class AssemblyHandler implements LanguageHandler<File> {
         HeadlessProgram prg = new HeadlessProgram(Program.DocumentType.assembly);
         prg.setValue(code);
         
-        CompileResult<File> lastResult = compile(prg);
+        CompileResult<ByteBuffer> lastResult = compile(prg);
         if (lastResult.isSuccessful()) {
             Emulator.withComputer(c -> {
                 RAM memory = c.getMemory();
-                try {
-                    FileInputStream input = new FileInputStream(lastResult.getCompiledAsset());
-                    int startLSB = input.read();
-                    int startMSB = input.read();
-                    int start = startLSB + startMSB << 8;
-                    System.out.printf("Storing assembled code to $%s%n", Integer.toHexString(start));
-                    c.getCpu().whileSuspended(() -> {
-                        try {
-                            int pos = start;
-                            int next;
-                            while ((next=input.read()) != -1) {
-                                memory.write(pos++, (byte) next, false, true);
-                            }
-                        } catch (IOException ex) {
-                            Logger.getLogger(AssemblyHandler.class.getName()).log(Level.SEVERE, null, ex);
-                        }
-                    });
-                } catch (IOException ex) {
-                    Logger.getLogger(AssemblyHandler.class.getName()).log(Level.SEVERE, null, ex);
-                }
+                ByteBuffer input = lastResult.getCompiledAsset();
+                input.rewind();
+                int startLSB = input.get();
+                int startMSB = input.get();
+                int start = startLSB + startMSB << 8;
+                System.out.printf("Storing assembled code to $%s%n", Integer.toHexString(start));
+                c.getCpu().whileSuspended(() -> {
+                    int pos = start;
+                    while (input.hasRemaining()) {
+                        memory.write(pos++, input.get(), false, true);
+                    }
+                });
             });
         }
     }
     
     @Override
-    public void execute(CompileResult<File> lastResult) {
+    public void execute(CompileResult<ByteBuffer> lastResult) {
         if (lastResult.isSuccessful()) {
             Emulator.withComputer(c -> {
                 RAM memory = c.getMemory();
-                try {
-                    FileInputStream input = new FileInputStream(lastResult.getCompiledAsset());
-                    int startLSB = input.read();
-                    int startMSB = input.read();
-                    int start = startLSB + startMSB << 8;
-                    System.out.printf("Issuing JSR to $%s%n", Integer.toHexString(start));
-                    c.getCpu().whileSuspended(() -> {
-                        try {
-                            int pos = start;
-                            int next;
-                            while ((next=input.read()) != -1) {
-                                memory.write(pos++, (byte) next, false, true);
-                            }
-                            c.getCpu().JSR(start);
-                        } catch (IOException ex) {
-                            Logger.getLogger(AssemblyHandler.class.getName()).log(Level.SEVERE, null, ex);
-                        }
-                    });
-                } catch (IOException ex) {
-                    Logger.getLogger(AssemblyHandler.class.getName()).log(Level.SEVERE, null, ex);
-                }
+                ByteBuffer input = lastResult.getCompiledAsset();
+                input.rewind();
+                int startLSB = input.get();
+                int startMSB = input.get();
+                int start = startLSB + startMSB << 8;
+                System.out.printf("Issuing JSR to $%s%n", Integer.toHexString(start));
+                c.getCpu().whileSuspended(() -> {
+                    int pos = start;
+                    while (input.hasRemaining()) {
+                        memory.write(pos++, input.get(), false, true);
+                    }
+                    c.getCpu().JSR(start);
+                });
             });
         }
         clean(lastResult);
     }
 
     @Override
-    public void clean(CompileResult<File> lastResult) {
-        if (lastResult.getCompiledAsset() != null) {
-            lastResult.getCompiledAsset().delete();
-        }
+    public void clean(CompileResult<ByteBuffer> lastResult) {
+        // Nothing to do here
     }
 }