From 0a4c82155b32d2f552f657514e4ac74f1354ef6b Mon Sep 17 00:00:00 2001
From: NewRisingSun <8vytz1+dhp372pv94ebg@sharklasers.com>
Date: Sat, 25 Oct 2025 13:49:24 +0200
Subject: [PATCH] Mapper 227: Correct the behavior of submapper 2. Remove
 submapper 3, as it's actually just mapper 280 without the reset-based UNROM
 game spot populated.

---
 src/boards/addrlatch.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/boards/addrlatch.c b/src/boards/addrlatch.c
index 040af3e..fd75151 100644
--- a/src/boards/addrlatch.c
+++ b/src/boards/addrlatch.c
@@ -395,10 +395,10 @@ static void M227Sync(void) {
 		} else {
 			if (L) {
 				setprg16(0x8000, p);
-				setprg16(0xC000, submapper ==3? 0: (p | 7));
+				setprg16(0xC000, p | 7);
 			} else {
 				setprg16(0x8000, p);
-				setprg16(0xC000, submapper ==2? 0: (p & 0x38));
+				setprg16(0xC000, submapper ==2? (p & 0x20): (p & 0x38));
 			}
 		}
 	}