Special Stage Systems MING MECCA, User Manual

Page: 74 / 154

64
d
d
COLLISION
outputs that generate
10V GATEs
in response to the inter-
action of
SPRITEs
and
TILEs
. The outputs are organized as follows:
S1/S2
—
SPRITE 1
collides with
SPRITE 2
S1/TILE
—
SPRITE 1
collides with
TILE 1
/
TILE 2
, as selected by
CLIP
S2/TILE
—
SPRITE 2
collides with
TILE 1
/
TILE 2
, as selected by
CLIP
T. EDGE
—
SPRITE 1
collides with the
TOP EDGE
of the screen
B. EDGE
—
SPRITE 1
collides with the
BOTTOM EDGE
of the screen
L. EDGE
—
SPRITE 1
collides with the
LEFT EDGE
of the screen
R. EDGE
—
SPRITE 1
collides with the
RIGHT EDGE
of the screen
Each output flips high according to different conditions. The
S1/S2
output flips high if and only if
SPRITE 1
and
SPRITE 2
are touching. The
S1/TILE
and
S2/TILE
outputs are contextual, depending on the current
CLIPPING
state. If
TILE 1
has been defined as a
SPRITE’s
obstacle, then
the corresponding output will flip high when the
SPRITE
touches
TILE 1
;
ditto if
TILE 2
has been defined as the obstacle. The
EDGE
outputs flip
high when
SPRITE 1
has hit the extreme boundaries of the screen, be-
hind the black borders.
The COLLISION outputs are always active, even when CLIP is
turned off, and will continue to fire when the SPRITE crosses
the boundary last selected by the CLIP toggle. This can be
used to determine what region of the MAP the SPRITE is cur-
rently in without restricting the SPRITE’s movement.
By modifying the WORLD CORE’s CONFIG.TXT , several alter-
nate COLLLISION modes can be selected that change the
behavior of the COLLISION outputs. See CHAPTER 5 for more
information.
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