diff --git a/src/vm/instruction.rs b/src/vm/instruction.rs
index dd5833d..9883d8b 100644
--- a/src/vm/instruction.rs
+++ b/src/vm/instruction.rs
@@ -69,20 +69,20 @@ pub fn execute_instruction(vm: &mut VM, instr: u16) {
     let opcode = get_opcode(instr);
 
     match opcode {
-        OpCode::BR => no_op(vm, instr),
-        OpCode::ADD => no_op(vm, instr),
-        OpCode::LD => no_op(vm, instr),
-        OpCode::ST => no_op(vm, instr),
-        OpCode::JSR => no_op(vm, instr),
-        OpCode::AND => no_op(vm, instr),
-        OpCode::LDR => no_op(vm, instr),
-        OpCode::STR => no_op(vm, instr),
-        OpCode::RTI => no_op(vm, instr),
-        OpCode::NOT => no_op(vm, instr),
-        OpCode::LDI => no_op(vm, instr),
-        OpCode::STI => no_op(vm, instr),
-        OpCode::JMP => no_op(vm, instr),
-        OpCode::RES => no_op(vm, instr),
+        OpCode::BR => todo!("BR"),
+        OpCode::ADD => todo!("ADD"),
+        OpCode::LD => todo!("LD"),
+        OpCode::ST => todo!("ST"),
+        OpCode::JSR => todo!("JSR"),
+        OpCode::AND => todo!("AND"),
+        OpCode::LDR => todo!("LDR"),
+        OpCode::STR => todo!("STR"),
+        OpCode::RTI => todo!("RTI"),
+        OpCode::NOT => todo!("NOT"),
+        OpCode::LDI => todo!("LDI"),
+        OpCode::STI => todo!("STI"),
+        OpCode::JMP => todo!("JMP"),
+        OpCode::RES => todo!("RES"),
         OpCode::LEA => op_lea(vm, instr),
         OpCode::TRAP => op_trap(vm, instr),
         OpCode::NOOP => no_op(vm, instr),