From 80d03f3c918bbbe4a388508dbfb73658486ce1b7 Mon Sep 17 00:00:00 2001
From: Lior Halphon <LIJI32@gmail.com>
Date: Sat, 9 Apr 2016 02:02:40 +0300
Subject: [PATCH] Added ROM-bank wrapping support, making bootleg game "Pocket
 Monster Adventures" boot.

(Although this game is better not booting)
---
 Core/memory.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Core/memory.c b/Core/memory.c
index 9ac5a1f..981bf7e 100644
--- a/Core/memory.c
+++ b/Core/memory.c
@@ -264,6 +264,11 @@ static void write_mbc(GB_gameboy_t *gb, unsigned short addr, unsigned char value
             break;
     }
 
+    /* Some games assume banks wrap around. We can do this if ROM size is a power of two */
+    if (gb->mbc_rom_bank >= gb->rom_size / 0x4000 && (gb->rom_size & (gb->rom_size - 1)) == 0 && gb->rom_size != 0) {
+        gb->mbc_rom_bank %= gb->rom_size / 0x4000;
+    }
+
     if (gb->cartridge_type->mbc_type != MBC5 && !gb->mbc_rom_bank) {
         gb->mbc_rom_bank = 1;
     }