- print $on_now;
- $on=change(1) if $on==0 && history(1,$STABILIZE_ON);
- $on=change(0) if $on==1 && history(0,$STABILIZE_OFF);
+ print(($ignore_read ? "_" : $on_now));
+ history(1,$STABILIZE_ON);
+ history(0,$STABILIZE_OFF);
+ $ignore_read=$ignore_write;
+ $ignore_write=0;