Alan SMR2u

Hi. Any developments to use on Atom?

For the coils themselves? here's the first good result from google, which lines up exactly with what Adam said. Sounds like you want the sequential option

So those coils have built-in ignitors.  I havent used these coils before but the pic below found online.  Pin 1 is the trigger wire as explained above.  Pin 2 is ground which should ideally be connected to a clean point on the cylinder head (not manifold etc).  Pin 3 is +12V, this should come from a relay that switches on and off with the ignition switch.

That will depend on what coils and ignitors etc.  But it is pretty simple.  The coil on #1 cyl trigger wire goes to ecu output ign 1.  Cyl 2 goes to ign 2 etc.