From 462f307324fa8c8d016579872124b12150c74a9d Mon Sep 17 00:00:00 2001
From: Barry Harris <44396066+barry65536@users.noreply.github.com>
Date: Thu, 22 Dec 2011 19:54:11 +0000
Subject: [PATCH] Delay the VBlank IRQ in CPS-2 driver until part way through
 VBlank period, fixes text in D&D games

---
 src/burn/drivers/capcom/cps_run.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/burn/drivers/capcom/cps_run.cpp b/src/burn/drivers/capcom/cps_run.cpp
index 2f07e22f7..8292ef9cd 100644
--- a/src/burn/drivers/capcom/cps_run.cpp
+++ b/src/burn/drivers/capcom/cps_run.cpp
@@ -423,8 +423,16 @@ INT32 Cps2Frame()
 //	nCpsCyclesSegment[0] = (nCpsCycles * nVBlank) / 0x0106;
 //	nDone += SekRun(nCpsCyclesSegment[0] - nDone);
 
+#if 0
+	// This triggers the VBlank IRQ straight away at display end,
+	// it causes glitches in the D&D games text (Press Start, Insert Coin, etc)
 	SekSetIRQLine(2, SEK_IRQSTATUS_AUTO);				// VBlank
 	SekRun(nCpsCycles - SekTotalCycles());
+#else
+	// Here we delay the VBlank IRQ until frame-end, or part-way through VBlank
+	SekRun(nCpsCycles - SekTotalCycles());
+	SekSetIRQLine(2, SEK_IRQSTATUS_AUTO);				// VBlank
+#endif
 	
 	if (pBurnDraw) {
 		CpsDraw();