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-rw-r--r--src/mame/video/psikyo.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mame/video/psikyo.cpp b/src/mame/video/psikyo.cpp
index 87ea0db20b2..3043670da1f 100644
--- a/src/mame/video/psikyo.cpp
+++ b/src/mame/video/psikyo.cpp
@@ -615,7 +615,8 @@ uint32_t psikyo_state::screen_update_psikyo_bootleg(screen_device &screen, bitma
if (layer_ctrl[layer] & 0x0300) /* per-line rowscroll */
{
- int tile_rowscroll = (layer_ctrl[layer] & 0x0200) >> 5; /* per-tile rowscroll */
+ int tile_rowscroll = (layer_ctrl[layer] & 0x0200) >> 7; /* per-tile rowscroll */
+ assert(tile_rowscroll == 0 || tile_rowscroll == 4);
if (m_old_linescroll[layer] != (layer_ctrl[layer] & 0x0300))
{
tmptilemap[layer]->set_scroll_rows(tilemap_width(tmsize[layer]) >> tile_rowscroll);