anchor.diff:  	if(update_state <= 1)
   		update_state |= UPSTATE_ALLGOOD
   
  +	if(operating)
  +		update_overlay |= APC_UPOVERLAY_OPERATING
  +
   	if(update_state & UPSTATE_ALLGOOD)
   		if(locked)
   			update_overlay |= APC_UPOVERLAY_LOCKED
  
positive.code: 			update_overlay |= APC_UPOVERLAY_ENVIRON1
  		else if(environ==2)
  			update_overlay |= APC_UPOVERLAY_ENVIRON2
  
  	var/results = 0
  	if(last_update_state == update_state && last_update_overlay == update_overlay)
  
negative.code: #define APC_UPOVERLAY_ENVIRON1 1024
  #define APC_UPOVERLAY_ENVIRON2 2048
  #define APC_UPOVERLAY_LOCKED 4096
  #define APC_UPOVERLAY_OPERATING 8192
  
  
  #define APC_UPDATE_ICON_COOLDOWN 200 // 20 seconds
  