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-rw-r--r--src/background.s4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/background.s b/src/background.s
index add7059..26d38c6 100644
--- a/src/background.s
+++ b/src/background.s
@@ -1,6 +1,10 @@
.segment "CODE"
.scope Background
+ ;; Screen coordinate on the Y axis where elements can begin to appear (e.g.
+ ;; upper bound for new enemies, starting point for falling items, etc.).
+ UPPER_MARGIN_Y_COORD = $10
+
;; Screen coordinates on the Y axis for the ground.
GROUND_Y_COORD = $C8