From 8eb4e3b80c23089c5b85c7ea9faf58afc8ff1923 Mon Sep 17 00:00:00 2001
From: NewRisingSun <8vytz1+dhp372pv94ebg@sharklasers.com>
Date: Sun, 14 Nov 2021 17:10:33 +0100
Subject: [PATCH] Mapper 196: Support IRQ for The Ancient & Modern Heroes

---
 src/boards/mmc3.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/boards/mmc3.c b/src/boards/mmc3.c
index 3fbfd22..48885de 100644
--- a/src/boards/mmc3.c
+++ b/src/boards/mmc3.c
@@ -1080,13 +1080,11 @@ static void M196PW(uint32 A, uint8 V) {
 }
 
 static DECLFW(Mapper196Write) {
-	if (A >= 0xC000) {
-		A = (A & 0xFFFE) | ((A >> 2) & 1) | ((A >> 3) & 1);
+	A =A &0xF000 | (!!(A &0xE) ^(A &1));
+	if (A >= 0xC000)
 		MMC3_IRQWrite(A, V);
-	} else {
-		A = (A & 0xFFFE) | ((A >> 2) & 1) | ((A >> 3) & 1) | ((A >> 1) & 1);
+	else
 		MMC3_CMDWrite(A, V);
-	}
 }
 
 static DECLFW(Mapper196WriteLo) {