Hi,
digging through the links on
Lemmings Universe (
post here on LF), I found
Mike Dailly's blog from 2021 through now. There is a page for
all Lemmings images of the blog. Among those, there are scans of the
Manual of DMA's Lemmings 1 editor:
Page 1Page 2Page 3Page 4Page 5On page 2, we learn that "X Co-ordinate goes from 0-1599, Y Co-ordinate goes from 0-199 although this includes the icons which do not form part of the level. (Not in this Universe anyway.)" Thus we should deduct some space from the Y range, but there is no reservation about the X range.
It follows that Lemmings 1 levels (Amiga at least?) are really 1600 pixels wide. On DOS, we can only see 1584 pixels, the screen cannot scroll all the way to the right. Nonetheless, through x = 1599 and
even beyond, the unscrollable emptiness behaves like air until
even the right edge eventually becomes solid.
On page 5, we learn what you can do with behind mode a.k.a. no-overwrite mode: "This applies to object mode as well, for such things as hidden exits."
-- Simon