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-rw-r--r--src/mame/drivers/pc9801.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mame/drivers/pc9801.cpp b/src/mame/drivers/pc9801.cpp
index 1e4cbaf3959..16c34dc56ba 100644
--- a/src/mame/drivers/pc9801.cpp
+++ b/src/mame/drivers/pc9801.cpp
@@ -787,7 +787,7 @@ UPD7220_DISPLAY_PIXELS_MEMBER( pc9801_state::hgdc_display_pixels )
res_x = x + xi;
res_y = y;
- pen = ext_gvram[((address*16+xi)+(m_vram_disp*0x40000)) >> 1];
+ pen = ext_gvram[(address >> 1)*16+xi+(m_vram_disp*0x20000)];
bitmap.pix32(res_y, res_x) = palette[pen + 0x20];
}