From a3d4db6b1a0617c83445b1eb7c43dcf3f2d714a7 Mon Sep 17 00:00:00 2001
From: g0me3 <cah4e3@gmail.com>
Date: Mon, 22 Jul 2019 13:32:42 +0300
Subject: [PATCH] fix for #68 (mapper 227 chr write protection emulation)

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

diff --git a/src/boards/addrlatch.cpp b/src/boards/addrlatch.cpp
index 44480ae9..10839821 100644
--- a/src/boards/addrlatch.cpp
+++ b/src/boards/addrlatch.cpp
@@ -354,6 +354,7 @@ static void M227Sync(void) {
 	uint32 L = (latche >> 9) & 1;
 
 	if ((latche >> 7) & 1) {
+		SetupCartCHRMapping(0, CHRptr[0], 0x2000, 0);	// hacky hacky write protection for CHR
 		if (S) {
 			setprg32(0x8000, p >> 1);
 		} else {
@@ -361,6 +362,7 @@ static void M227Sync(void) {
 			setprg16(0xC000, p);
 		}
 	} else {
+		SetupCartCHRMapping(0, CHRptr[0], 0x2000, 1);	// hacky hacky write protection for CHR
 		if (S) {
 			if (L) {
 				setprg16(0x8000, p & 0x3E);