From 8b78b2943eb3d9a6813ee4730c8f1f3c698f1bf5 Mon Sep 17 00:00:00 2001
From: Rekai Musuka <rekai@musuka.dev>
Date: Thu, 19 Aug 2021 16:09:58 -0500
Subject: [PATCH] fix(cartridge): specify intentional overflow in MBC5

---
 src/cartridge.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/cartridge.rs b/src/cartridge.rs
index b178d92..4d09a75 100644
--- a/src/cartridge.rs
+++ b/src/cartridge.rs
@@ -372,7 +372,9 @@ impl MBCIo for MBC5 {
 
         match addr {
             0x0000..=0x3FFF => Address(addr as usize),
-            0x4000..=0x7FFF => Address(0x4000 * self.rom_bank as usize + (addr as usize - 0x4000)),
+            0x4000..=0x7FFF => {
+                Address(0x4000u16.wrapping_mul(self.rom_bank) as usize + (addr as usize - 0x4000))
+            }
             0xA000..=0xBFFF if self.mem_enabled => {
                 Value(self.memory[0x2000 * self.ram_bank as usize + (addr as usize - 0xA000)])
             }