From e854a759f8a1c66da933b32eccdcc3501b0582e0 Mon Sep 17 00:00:00 2001
From: Brandon Wright <bearoso@gmail.com>
Date: Sat, 9 Mar 2019 17:16:54 -0600
Subject: [PATCH] Fix Chou Aniki. Remove hack.

---
 cpuexec.cpp | 9 +++++++--
 cpuops.cpp  | 4 ++--
 memmap.cpp  | 2 --
 ppu.cpp     | 3 +--
 snes9x.h    | 7 ++++---
 5 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/cpuexec.cpp b/cpuexec.cpp
index cba037e7..cd2b1ba1 100644
--- a/cpuexec.cpp
+++ b/cpuexec.cpp
@@ -24,9 +24,14 @@ void S9xMainLoop (void)
 	#define CHECK_FOR_IRQ_CHANGE() \
 	if (Timings.IRQFlagChanging) \
 	{ \
-		if (Timings.IRQFlagChanging == IRQ_CLEAR_FLAG) \
+		if (Timings.IRQFlagChanging & IRQ_TRIGGER_NMI) \
+		{ \
+			CPU.NMIPending = TRUE; \
+			Timings.NMITriggerPos = CPU.Cycles + 6; \
+		} \
+		if (Timings.IRQFlagChanging & IRQ_CLEAR_FLAG) \
 			ClearIRQ(); \
-		else if (Timings.IRQFlagChanging == IRQ_SET_FLAG) \
+		else if (Timings.IRQFlagChanging & IRQ_SET_FLAG) \
 			SetIRQ(); \
 		Timings.IRQFlagChanging = IRQ_NONE; \
 	}
diff --git a/cpuops.cpp b/cpuops.cpp
index f200068b..b2342bae 100644
--- a/cpuops.cpp
+++ b/cpuops.cpp
@@ -1452,7 +1452,7 @@ static void Op58 (void)
 	AddCycles(ONE_CYCLE);
 
 #ifndef SA1_OPCODES
-	Timings.IRQFlagChanging = IRQ_CLEAR_FLAG;
+	Timings.IRQFlagChanging |= IRQ_CLEAR_FLAG;
 #else
 	ClearIRQ();
 #endif
@@ -1464,7 +1464,7 @@ static void Op78 (void)
 	AddCycles(ONE_CYCLE);
 
 #ifndef SA1_OPCODES
-	Timings.IRQFlagChanging = IRQ_SET_FLAG;
+	Timings.IRQFlagChanging |= IRQ_SET_FLAG;
 #else
 	SetIRQ();
 #endif
diff --git a/memmap.cpp b/memmap.cpp
index 392efceb..7d18f2f9 100644
--- a/memmap.cpp
+++ b/memmap.cpp
@@ -3614,8 +3614,6 @@ void CMemory::ApplyROMFixes (void)
 	{
 		//if (match_id("AVCJ"))                                      // Rendering Ranger R2
 		//	Timings.APUSpeedup = 2;
-		if (match_id("AANJ"))                                      // Chou Aniki
-			Timings.APUSpeedup = -3;
 		if (match_na("CIRCUIT USA"))
 			Timings.APUSpeedup = 3;
 
diff --git a/ppu.cpp b/ppu.cpp
index 6bca9dc4..50446f3f 100644
--- a/ppu.cpp
+++ b/ppu.cpp
@@ -1403,8 +1403,7 @@ void S9xSetCPU (uint8 Byte, uint16 Address)
 				{
 					// FIXME: triggered at HC+=6, checked just before the final CPU cycle,
 					// then, when to call S9xOpcode_NMI()?
-					CPU.NMIPending = TRUE;
-					Timings.NMITriggerPos = CPU.Cycles + 6 + 6;
+					Timings.IRQFlagChanging |= IRQ_TRIGGER_NMI;
 
 					#ifdef DEBUGGER
 					if (Settings.TraceHCEvent)
diff --git a/snes9x.h b/snes9x.h
index e096a1de..82d3aaf3 100644
--- a/snes9x.h
+++ b/snes9x.h
@@ -157,9 +157,10 @@ enum
 
 enum
 {
-	IRQ_NONE = 0,
-	IRQ_SET_FLAG = 1,
-	IRQ_CLEAR_FLAG = 2
+	IRQ_NONE        = 0x0,
+	IRQ_SET_FLAG    = 0x1,
+	IRQ_CLEAR_FLAG  = 0x2,
+	IRQ_TRIGGER_NMI = 0x4
 };
 
 struct STimings