From db5855b9516bb54c4e40434994c221dcea43064f Mon Sep 17 00:00:00 2001
From: NewRisingSun <8vytz1+dhp372pv94ebg@sharklasers.com>
Date: Sun, 1 Feb 2026 11:25:21 +0100
Subject: [PATCH] Add mapper 429 submapper 2.

---
 src/boards/datalatch.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/boards/datalatch.c b/src/boards/datalatch.c
index 32d3d92..127de4f 100644
--- a/src/boards/datalatch.c
+++ b/src/boards/datalatch.c
@@ -558,7 +558,10 @@ void BMCK3046_Init(CartInfo *info) {
 
 static void Mapper429_Sync(void) {
 	setprg32(0x8000, latche >>2);
-	setchr8(latche);
+	if (submapper == 2)
+		setchr8(latche &3 | (latche &4 && latche &8? 4: 0));
+	else
+		setchr8(latche);
 }
 
 static void Mapper429_Reset(void) {
@@ -567,6 +570,7 @@ static void Mapper429_Reset(void) {
 }
 
 void Mapper429_Init(CartInfo *info) {
+	submapper = info->submapper;
 	info->Reset = Mapper429_Reset;
 	Latch_Init(info, Mapper429_Sync, 0, 0x8000, 0xFFFF, 0, 0);
 }