From 2142282f69d7ee72d5ca851afe505536ff364ced Mon Sep 17 00:00:00 2001
From: lacastri <43101266+lacastri@users.noreply.github.com>
Date: Sat, 8 Sep 2018 18:49:42 -0500
Subject: [PATCH] daffy duck irq non-reschedule

---
 ppu.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ppu.cpp b/ppu.cpp
index 001a4a23..cf904b55 100644
--- a/ppu.cpp
+++ b/ppu.cpp
@@ -1566,7 +1566,8 @@ void S9xSetCPU (uint8 Byte, uint16 Address)
 					CPU.IRQTransition = FALSE;
 				}
 
-				S9xUpdateIRQPositions(false);
+				if ((Byte & 0x30) != (Memory.FillRAM[0x4200] & 0x30))
+					S9xUpdateIRQPositions(false);
 
 				// NMI can trigger immediately during VBlank as long as NMI_read ($4210) wasn't cleard.
 				if ((Byte & 0x80) && !(Memory.FillRAM[0x4200] & 0x80) &&