diff --git a/src/cartridge.rs b/src/cartridge.rs
index acbf4d6..2889082 100644
--- a/src/cartridge.rs
+++ b/src/cartridge.rs
@@ -62,7 +62,6 @@ impl Cartridge {
             MemoryBankControllerType::MBC1 => Box::new(super::mbc::mbc1::MBC1::new(rom, ram)),
             MemoryBankControllerType::MBC2 => Box::new(super::mbc::mbc2::MBC2::new(rom, ram)),
             MemoryBankControllerType::MBC3 => Box::new(super::mbc::mbc3::MBC3::new(rom, ram)),
-            // _ => panic!("{:?} not implemented", mbc_type),
         };
 
         Cartridge {
diff --git a/src/mbc/mbc1.rs b/src/mbc/mbc1.rs
index 2fc029e..6c575e5 100644
--- a/src/mbc/mbc1.rs
+++ b/src/mbc/mbc1.rs
@@ -19,7 +19,7 @@ impl MBC1 {
         MBC1 {
             rom: rom,
             ram: ram,
-            rom_bank_no: 0,
+            rom_bank_no: 1,
             bank_mode: BankMode::RomBankMode,
             bank_no_high: 0,
 
@@ -29,7 +29,7 @@ impl MBC1 {
 
     fn active_rom_bank(&self) -> u8 {
         match self.bank_mode {
-            BankMode::RomBankMode => self.rom_bank_no | self.bank_no_high << 5,
+            BankMode::RomBankMode => self.rom_bank_no | (self.bank_no_high << 5),
             BankMode::RamBankMode => self.rom_bank_no
         }
     }
diff --git a/src/mbc/mbc2.rs b/src/mbc/mbc2.rs
index 8a53c0b..f6c3fc0 100644
--- a/src/mbc/mbc2.rs
+++ b/src/mbc/mbc2.rs
@@ -12,7 +12,7 @@ impl MBC2 {
         MBC2 {
             rom: rom,
             ram: ram,
-            rom_bank_no: 0,
+            rom_bank_no: 1,
             ram_enable: false,
         }
     }
diff --git a/src/mbc/mbc3.rs b/src/mbc/mbc3.rs
index 07aacf2..c059d1c 100644
--- a/src/mbc/mbc3.rs
+++ b/src/mbc/mbc3.rs
@@ -13,7 +13,7 @@ impl MBC3 {
         MBC3 {
             rom: rom,
             ram: ram,
-            rom_bank_no: 0,
+            rom_bank_no: 1,
             ram_bank_no: 0,
             ram_rtc_enabled: false,
         }