     return gpu_palette;
   }
 
-  // printf("warn: unhandled read from GPU register: $%04X\n", address);
+  printf("warn: unhandled read from GPU register: $%04X\n", address);
   return 0;
 }
 

    if evt_type == 0x100 {
      // Quit – App was asked to quit (nicely)
      is_running = false;
      return;
    }
  }
}

  }

  // STEP -> Interrupts
  let irq = IF & IE;
  if IME and irq > 0 {
    om_push16(&PC);
