diff --git a/HelloWorld.bin b/HelloWorld.bin
new file mode 100644
index 0000000..e14a5b3
Binary files /dev/null and b/HelloWorld.bin differ
diff --git a/src/computer.ts b/src/computer.ts
index 2778620..bedea5d 100644
--- a/src/computer.ts
+++ b/src/computer.ts
@@ -85,7 +85,7 @@ export class Computer {
 		if (this.current_instr === null) {
 			const parsed_instruction = Computer.parse_instruction(current_byte);
 			if (parsed_instruction === null) {
-				console.log("invalid instruction");
+				// console.log("invalid instruction");
 				this.step_forward();
 				return;
 			}
@@ -104,7 +104,6 @@ export class Computer {
 		}
 
 		if (this.current_instr.params.length !== this.current_instr.params_found) {
-			// console.log(`Parameter count not fulfilled. Found new parameter ${current_byte}`);
 			this.current_instr.params[this.current_instr.params_found] = current_byte;
 			this.current_instr.params_found += 1;
 		}
@@ -137,12 +136,12 @@ export class Computer {
 			case Instr.Print: {
 				const [register_no] = inst.params;
 				const value = this.registers[register_no];
-				console.log(value);
+				// console.log(value);
 				break;
 			}
 			case Instr.Goto: {
 				const [parameter] = inst.params;
-				console.log(`Goto ${parameter}`);
+				// console.log(`Goto ${parameter}`);
 				this.program_counter = parameter;
 				return false;
 			}
@@ -159,7 +158,7 @@ export class Computer {
 				if (register_no >= this.registers.length) {
 					throw new Error(`Got register number ${register_no} in assign register`);
 				}
-				console.log(`Set register ${register_no} to ${new_value}`);
+				// console.log(`Set register ${register_no} to ${new_value}`);
 				this.registers[register_no] = new_value;
 				break;
 			}
@@ -232,10 +231,18 @@ export class Computer {
 
 				const char = String.fromCharCode(ASCIIbyte);
 
-				console.log(char);
+				// console.log(char);
 				$("printout").textContent += char;
 				break;
 			}
+			case Instr.HaltCatchFire: {
+				throw new Error("FIRE FIRE FIRE FIRE");
+			}
+			case Instr.CopyRegReg: {
+				const [register_no_to, register_no_from] = inst.params;
+				this.registers[register_no_to] = this.registers[register_no_from];
+				break;
+			}
 			default:
 				break;
 		}
diff --git a/src/index.ts b/src/index.ts
index e641507..e176d35 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -13,7 +13,7 @@ function main(): void {
 
 	const ui = new UI(container);
 
-	const computer = new Computer(ui.stateUpdateEvent.bind(ui));
+	const computer = new Computer(ui.state_update_event.bind(ui));
 
 	computer.load_program(program);
 	ui.set_step_func(computer.cycle.bind(computer));
diff --git a/src/ui.ts b/src/ui.ts
index 62534a9..410e930 100644
--- a/src/ui.ts
+++ b/src/ui.ts
@@ -28,43 +28,39 @@ export class UI {
 		for (let i = 0; i < 8; i++) {
 			const reg_cell = el("div", `R_${i}`);
 			reg_cell.textContent = "00";
-			reg_cell.setAttribute("contenteditable", "true");
-			reg_cell.setAttribute("spellcheck", "false");
+			// reg_cell.setAttribute("contenteditable", "true");
+			// reg_cell.setAttribute("spellcheck", "false");
 			registers.appendChild(reg_cell);
 			this.register_cells.push(reg_cell);
 		}
-		// eslint-disable-next-line prefer-arrow-callback
-		registers.addEventListener("input", function (e) {
-			const allowed_chars = "0123456789ABCDEFG";
-			const r = e.target as HTMLElement;
-			let data = (r.textContent as string).toUpperCase();
+		// // eslint-disable-next-line prefer-arrow-callback
+		// registers.addEventListener("input", function (e) {
+		// 	const allowed_chars = "0123456789ABCDEFG";
+		// 	const r = e.target as HTMLElement;
+		// 	let data = (r.textContent as string).toUpperCase();
 
-			for (let i = 0; i < data.length; i++) {
-				if (!allowed_chars.includes(data[i])) {
-					data = "00";
-					break;
-				}
-			}
+		// 	for (let i = 0; i < data.length; i++) {
+		// 		if (!allowed_chars.includes(data[i])) {
+		// 			data = "00";
+		// 			break;
+		// 		}
+		// 	}
 
-			if (data.length > 2) {
-				// data = r.textContent?.substring(0, 2) ?? "00";
-			}
-			e.preventDefault();
-			return false;
-			// r.textContent = ;
-		});
+		// 	e.preventDefault();
+		// 	return false;
+		// });
 
-		registers.addEventListener("keydown", (e) => {
-			if (e.key === "Enter") {
-				e.preventDefault();
-				(e.target as HTMLElement).blur();
-			}
-		});
-		registers.addEventListener("blur", (e) => {
-			const allowed_chars = "0123456789ABCDEFG";
-			const r = e.target as HTMLElement;
-			const data = (r.textContent as string).toUpperCase();
-		});
+		// registers.addEventListener("keydown", (e) => {
+		// 	if (e.key === "Enter") {
+		// 		e.preventDefault();
+		// 		(e.target as HTMLElement).blur();
+		// 	}
+		// });
+		// registers.addEventListener("blur", (e) => {
+		// 	const allowed_chars = "0123456789ABCDEFG";
+		// 	const r = e.target as HTMLElement;
+		// 	const data = (r.textContent as string).toUpperCase();
+		// });
 
 		this.registers = registers;
 
@@ -95,7 +91,7 @@ export class UI {
 		});
 	}
 
-	start_auto(speed: number = 0): void {
+	start_auto(speed: number = 200): void {
 		if (this.step_func === null) {
 			return;
 		}
@@ -125,7 +121,7 @@ export class UI {
 		this.step_func = f;
 	}
 
-	stateUpdateEvent(state: ComputerState): void {
+	state_update_event(state: ComputerState): void {
 		for (let i = 0; i < 256; i++) {
 			const current = this.program_memory_cells[i];
 			current.className = "";