Had some on-screen-enemy-drawing issues.
Atlantean was using absolute scrolling, so wrapping the map was an issue.
Swapped it out to relative scrolling (per OldMan). It sort of fixed things.
We battled with it for the past few days, planning/experimenting with the checks...
and now, I think it finally works right.
Wrapping is awful!
In other news:
CCAG 2012 SOON. GET READY! We will be there. Front and center-ish, rockin the PC Engine/Turbo Grafx-16 homebrew harder than ever.