diff --git a/boot.js b/boot.js
index 6bca6ae..96bc257 100644
--- a/boot.js
+++ b/boot.js
@@ -10,10 +10,17 @@ const assemble = (async () => {
 })();
 
 self.onmessage = async (e) => {
-	const exports = { emu: { mem: e.data } };
-	const wasm = await assemble;
-	const mod = await WebAssembly.instantiate(wasm, exports);
-	await self.postMessage('booting');
-	mod.instance.exports.reset();
-	console.log('System halt');
+	switch (e.data.type) {
+	case "load":
+		const exports = { emu: { mem: e.data.mem } };
+		const wasm = await assemble;
+		self.mod = await WebAssembly.instantiate(wasm, exports);
+		await self.postMessage('ready');
+		break;
+
+	case "boot":
+		self.mod.instance.exports.reset();
+		console.log('System halt');
+		break;
+	}
 };
diff --git a/emu.js b/emu.js
index 337b2a6..ad4488a 100644
--- a/emu.js
+++ b/emu.js
@@ -54,10 +54,11 @@ class Emulator {
 		this.print("Assembling kernel ");
 		const dots = setInterval(() => this.print("."), DOT_INTERVAL_MS);
 		this.worker = new Worker('boot.js', { type: 'module' });
-		this.worker.postMessage(this.mem);
+		this.worker.postMessage({ type: "load", mem: this.mem });
 		this.worker.onmessage = (e) => {
 			clearInterval(dots);
 			this.print(" done\n");
+			this.worker.postMessage({ type: "boot" });
 		};
 
 		fetch('prelude.f')
diff --git a/prelude.f b/prelude.f
index b8191b9..379b181 100644
--- a/prelude.f
+++ b/prelude.f
@@ -250,7 +250,7 @@ CHAR . EMIT
 
 0 CONSTANT VERSION-MAJOR
 2 CONSTANT VERSION-MINOR
-0 CONSTANT VERSION-PATCH
+1 CONSTANT VERSION-PATCH
 
 : PRINT-VERSION
   CHAR v EMIT VERSION-MAJOR .