diff --git a/src/emulator/main.rs b/src/emulator/main.rs
index 5cc4584..510ee7d 100644
--- a/src/emulator/main.rs
+++ b/src/emulator/main.rs
@@ -111,6 +111,11 @@ fn tick(state: &mut EmulatorState) {
         0x2b => arithmetic::dcx(Register::H, state),
         0x3b => arithmetic::dcx(Register::SP, state),
 
+        0x27 => panic!("Auxiliary Carry not implemented, unable to execute DAA instruction"),
+        0x2f => state.a = !state.a,       // CMA
+        0x37 => state.cc.c = true,        // STC
+        0x3f => state.cc.c = !state.cc.c, // CMC
+
         0x80..=0x87 => arithmetic::add_reg(register_from_num(instruction & 0xf), false, state), // ADD
         0x88..=0x8f => arithmetic::add_reg(register_from_num(instruction & 0xf), state.cc.c, state), // ADC
         0xc6 => arithmetic::add(next_byte(), false, state), // ADI