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-rw-r--r--src/mame/video/hng64.cpp4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/mame/video/hng64.cpp b/src/mame/video/hng64.cpp
index 86d76c647a6..b3ff066a323 100644
--- a/src/mame/video/hng64.cpp
+++ b/src/mame/video/hng64.cpp
@@ -1049,8 +1049,8 @@ uint32_t hng64_state::screen_update_hng64(screen_device &screen, bitmap_rgb32 &b
WRITE_LINE_MEMBER(hng64_state::screen_vblank_hng64)
{
- // rising edge
- if (state)
+ // rising edge and buffer swap
+ if (state && (m_tcram[0x50/4] & 0x10000))
clear3d();
}