1 files changed, 19 insertions, 0 deletions
diff --git a/src/home/unsafe_bg_map.asm b/src/home/unsafe_bg_map.asm
new file mode 100644
index 0000000..fb45c0e
--- /dev/null
+++ b/src/home/unsafe_bg_map.asm
@@ -0,0 +1,19 @@
+; reads struct:
+;   x (1 byte), y (1 byte), data (n bytes), $00
+; writes data to BGMap0-translated x,y
+; important: make sure VRAM can be accessed first, else use WriteDataBlockToBGMap0
+UnsafeWriteDataBlockToBGMap0:
+	ld a, [hli]
+	ld b, a
+	ld a, [hli]
+	ld c, a
+	call BCCoordToBGMap0Address
+	jr .next
+.loop
+	ld [de], a
+	inc de
+.next
+	ld a, [hli]
+	or a
+	jr nz, .loop
+	ret