Engine/Zero is teh Aleph One replacement. Not backwards compatible. Won't run until you get a scenario too.

Cool stuff to do:

Press M for the fancy 3D map

press T then type any of the following (soz you won't be able to see the text :( ) then press enter.

ScanVision 1

Zooming 1

and there's many more but I can't be bothered putting them here.

Oh well anyway E0 rocks.