From ab4e68da8c9a2486ecf2c7fc232b5442d4a6d990 Mon Sep 17 00:00:00 2001
From: zeromus <zeromus@users.sf.net>
Date: Sat, 24 Sep 2011 23:37:56 +0000
Subject: [PATCH] newppu-fix bug in scroll reg logic causing mis-scrolls in
 p'radikus conflict

---
 src/ppu.cpp | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/ppu.cpp b/src/ppu.cpp
index 8f8bafef..b0094088 100644
--- a/src/ppu.cpp
+++ b/src/ppu.cpp
@@ -207,11 +207,15 @@ struct PPUREGS {
 
 	void increment_vs() {
 		fv++;
-		vt += (fv>>3);
+		int fv_overflow = (fv >> 3);
+		vt += fv_overflow;
 		vt &= 31; //fixed tecmo super bowl
-		v += (vt==30)?1:0;
+		if(vt == 30 && fv_overflow==1) //caution here (only do it at the exact instant of overflow) fixes p'radikus conflict
+		{
+			v++;
+			vt=0;
+		}
 		fv &= 7;
-		if(vt==30) vt=0;
 		v &= 1;
 	}