From f39506365a6cfa4de67129e6ec0d6237d8d29564 Mon Sep 17 00:00:00 2001
From: NewRisingSun <8vytz1+dhp372pv94ebg@sharklasers.com>
Date: Tue, 15 Feb 2022 21:02:06 +0100
Subject: [PATCH] Mapper 554: Correct CHR bank selection during opening

---
 src/boards/554.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/boards/554.c b/src/boards/554.c
index bbb4796..7559a83 100644
--- a/src/boards/554.c
+++ b/src/boards/554.c
@@ -43,17 +43,18 @@ static void Sync(void) {
 }
 
 static DECLFR(M554Read) {
-    if ((A >= 0xCAB6) && (A < 0xCAD7))
+    int A1 = A &~1;
+    if ((A >= 0xCAB6) && (A <= 0xCAD7))
     {
         reg = (A >> 2) & 0x0F;
         Sync();
     }
-    else if ((A == 0xEBE2) || (A == 0xEE32))
+    else if ((A1 == 0xEBE2) || (A1 == 0xEE32))
     {
         reg = (A >> 2) & 0x0F;
         Sync();
     }
-    else if (A == 0xFFFC)
+    else if (A1 == 0xFFFC)
     {
         reg = (A >> 2) & 0x0F;
         Sync();