From 02f8077408024862a61c3b1c862e2e818b675759 Mon Sep 17 00:00:00 2001
From: NewRisingSun <8vytz1+dhp372pv94ebg@sharklasers.com>
Date: Sun, 8 Feb 2026 11:42:37 +0100
Subject: [PATCH] Add mapper 571 submapper 1.

---
 src/boards/571.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/boards/571.c b/src/boards/571.c
index c759426..6189f65 100644
--- a/src/boards/571.c
+++ b/src/boards/571.c
@@ -23,6 +23,7 @@
 #include "mapinc.h"
 #include "asic_vrc2and4.h"
 
+static uint8 submapper;
 static uint8 reg;
 
 static void sync () {
@@ -33,7 +34,7 @@ static void sync () {
 	if (reg &0x20)
 		VRC24_syncPRG(prgAND, prgOR &~prgAND);
 	else
-	if (reg &0x6)
+	if (submapper == 0 && reg &0x06 || submapper == 1 && reg &0x02 && reg &0x04)
 		setprg32(0x8000, reg >>1);
 	else {
 		setprg16(0x8000, reg);
@@ -65,6 +66,7 @@ static void power () {
 }
 
 void Mapper571_Init (CartInfo *info) {
+	submapper = info->submapper;
 	VRC4_init(info, sync, 4, 8, 1, NULL, NULL, NULL, writeReg, NULL);
 	info->Power = power;
 	info->Reset = reset;