diff --git a/build.gradle b/build.gradle
index ed88d78..2064e23 100644
--- a/build.gradle
+++ b/build.gradle
@@ -52,7 +52,7 @@ dependencies {
 	// And its provides the option to then use net.minecraft as the group, and one of; client, server or joined as the module name, plus the game version as version.
 	// For all intends and purposes: You can treat this dependency as if it is a normal library you would use.
 	implementation "net.neoforged:neoforge:${neo_version}"
-	libraries 'com.dylibso.chicory:runtime:0.0.12'
+	libraries 'org.mozilla:rhino-engine:1.7.15'
 	// Example optional mod dependency with JEI
 	// The JEI API is declared for compile time use, while the full JEI artifact is used at runtime
 	// compileOnly "mezz.jei:jei-${mc_version}-common-api:${jei_version}"
diff --git a/src/main/java/dev/exhq/ajarc/computer/ComputerBlockEntity.java b/src/main/java/dev/exhq/ajarc/computer/ComputerBlockEntity.java
index d6528c2..139fe42 100644
--- a/src/main/java/dev/exhq/ajarc/computer/ComputerBlockEntity.java
+++ b/src/main/java/dev/exhq/ajarc/computer/ComputerBlockEntity.java
@@ -4,6 +4,7 @@ import com.mojang.serialization.MapCodec;
 import dev.exhq.ajarc.Ajar;
 import dev.exhq.ajarc.network.ComputerScreenUpdate;
 import dev.exhq.ajarc.register.Register;
+import dev.exhq.ajarc.vm.JsVm;
 import dev.exhq.ajarc.vm.WasmVm;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.HolderLookup;
@@ -34,7 +35,6 @@ public class ComputerBlockEntity extends BlockEntity {
 	private static final MapCodec<ComputerTerminal> screenCodec = ComputerTerminal.CODEC
 			.fieldOf("screen")
 			.setPartial(() -> ComputerTerminal.ofSize(20, 30));
-	private WasmVm vm = new WasmVm(this);
 	private List<String> lines = new ArrayList<>();
 
 	@Override
@@ -76,19 +76,20 @@ public class ComputerBlockEntity extends BlockEntity {
 
 	public void executeCommand(String line) {
 		lines.add("$ " + line);
-		if (line.equals("small")) {
-			screen = ComputerTerminal.ofSize(10, 20);
-			lines.add("Made small!");
-		} else if (line.equals("big")) {
-			screen = ComputerTerminal.ofSize(20, 30);
-			lines.add("Made big!");
-		} else if (line.equals("add")) {
-			int left = 42, right = 69;
-			int result = vm.add(left, right);
-			lines.add(left + " + " + right + " = " + result);
-		} else {
-			lines.add("Made unknown!");
-		}
+		lines.add(JsVm.EvalJs(line));
+//		if (line.equals("small")) {
+//			screen = ComputerTerminal.ofSize(10, 20);
+//			lines.add("Made small!");
+//		} else if (line.equals("big")) {
+//			screen = ComputerTerminal.ofSize(20, 30);
+//			lines.add("Made big!");
+//		} else if (line.startsWith("add")) {
+//			var newline = line.replaceFirst("add ", "").split(" ");
+//			lines.add(JsVm.EvalJs("mathj.add("+newline[0]+","+newline[1]+")"));
+//		}
+//		else {
+//			lines.add("Made unknown!");
+//		}
 	}
 
 	public ComputerScreenUpdate getSyncPacket(int windowId) {
diff --git a/src/main/java/dev/exhq/ajarc/vm/JsVm.java b/src/main/java/dev/exhq/ajarc/vm/JsVm.java
new file mode 100644
index 0000000..3424004
--- /dev/null
+++ b/src/main/java/dev/exhq/ajarc/vm/JsVm.java
@@ -0,0 +1,25 @@
+package dev.exhq.ajarc.vm;
+
+import dev.exhq.ajarc.computer.ComputerBlockEntity;
+import org.mozilla.javascript.Context;
+import org.mozilla.javascript.Scriptable;
+import org.mozilla.javascript.ScriptableObject;
+
+public class JsVm {
+	public static String EvalJs(String command){
+		var cx = Context.enter();
+		try {
+			Scriptable scope = cx.initStandardObjects();
+			MathJ mathJ = new MathJ();
+			Object wrappedJsVm = Context.javaToJS(mathJ, scope);
+			ScriptableObject.putProperty(scope, "mathj", wrappedJsVm);
+			Object result = cx.evaluateString(scope, command, "<cmd>", 1, null);
+
+			return Context.toString(result);
+		} finally {
+			Context.exit();
+		}
+	}
+
+
+}
\ No newline at end of file
diff --git a/src/main/java/dev/exhq/ajarc/vm/MathJ.java b/src/main/java/dev/exhq/ajarc/vm/MathJ.java
new file mode 100644
index 0000000..3d0a32f
--- /dev/null
+++ b/src/main/java/dev/exhq/ajarc/vm/MathJ.java
@@ -0,0 +1,7 @@
+package dev.exhq.ajarc.vm;
+
+public class MathJ {
+	public int add(int a, int b) {
+		return a + b;
+	}
+}