From efa2fb25be9a824767b5bd506496a903ea864793 Mon Sep 17 00:00:00 2001
From: cracyc <cracyc@users.noreply.github.com>
Date: Sun, 22 Sep 2024 21:44:57 -0500
Subject: [PATCH] x68k: further adjust vblank irq

---
 src/mame/sharp/x68k_crtc.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/mame/sharp/x68k_crtc.cpp b/src/mame/sharp/x68k_crtc.cpp
index 6614075d07f..f86dfc13d40 100644
--- a/src/mame/sharp/x68k_crtc.cpp
+++ b/src/mame/sharp/x68k_crtc.cpp
@@ -278,7 +278,7 @@ TIMER_CALLBACK_MEMBER(x68k_crtc_device::vblank_irq)
 	if (val == 0)  // V-DISP off
 	{
 		m_vblank = 0;
-		vblank_line = m_vend + 1;
+		vblank_line = m_vend + (gfx_double_scan() ? 2 : 1);
 		if (vblank_line > m_vtotal)
 			vblank_line = m_vtotal;
 		irq_time = screen().time_until_pos(vblank_line, 2);