Editing Guide to circuits (section)

=== A Note on "push ref" ===

Some circuits, especially those with an output pin that references itself, have a PULSE_IN pin called "push ref." When pulsed, this pin will cause any other components this part is linked to via that reference to actually obtain the reference for it. However, if you ''don't'' do this, then it will refer to the self-reference of the component as null, thus making it impossible to work. For this reason, "push ref" should be pulsed '''''exactly once''''' in order to synchronize it with other components.

The easiest way to do this is with a "starter" component, in the Power - Passive section. This component will pulse out a single time whenever the machine gains power. Linking the starter's "pulse out" to any "push ref" pins in your circuit is essential to getting them to work. You can also assign them in other ways, but note that pulsing "push ref" while the machine is running ''will'' cause it to malfunction and not work with no clear indicator.