diff --git a/src/device/cart/rom.rs b/src/device/cart/rom.rs
index 47025d0..be261c6 100644
--- a/src/device/cart/rom.rs
+++ b/src/device/cart/rom.rs
@@ -99,18 +99,20 @@ pub fn dma_read(
         cart_addr &= CART_MASK as u32;
 
         for i in 0..length {
-            device.cart.rom[(cart_addr + i) as usize] =
-                device.rdram.mem[(dram_addr + i) as usize ^ device.byte_swap];
+            if cart_addr + i < device.cart.rom.len() as u32 {
+                device.cart.rom[(cart_addr + i) as usize] =
+                    device.rdram.mem[(dram_addr + i) as usize ^ device.byte_swap];
 
-            device
-                .ui
-                .saves
-                .romsave
-                .0
-                .insert(cart_addr + i, device.cart.rom[(cart_addr + i) as usize]);
+                device
+                    .ui
+                    .saves
+                    .romsave
+                    .0
+                    .insert(cart_addr + i, device.cart.rom[(cart_addr + i) as usize]);
+
+                device.ui.saves.romsave.1 = true;
+            }
         }
-
-        device.ui.saves.romsave.1 = true;
     }
 
     device::pi::calculate_cycles(device, 1, length)
diff --git a/src/device/cart/sc64.rs b/src/device/cart/sc64.rs
index 674d4bf..9e1f6c6 100644
--- a/src/device/cart/sc64.rs
+++ b/src/device/cart/sc64.rs
@@ -44,7 +44,7 @@ pub fn read_regs(
     match reg as u32 {
         SC64_SCR_REG | SC64_DATA0_REG | SC64_DATA1_REG => device.sc64.regs[reg as usize],
         SC64_IDENTIFIER_REG => 0x53437632,
-        _ => panic!("unknown read reg {} address {:x}", reg, address),
+        _ => panic!("unknown read reg {} address {:#x}", reg, address),
     }
 }
 
@@ -182,7 +182,7 @@ pub fn write_regs(device: &mut device::Device, address: u64, value: u32, mask: u
             }
         }
         _ => panic!(
-            "unknown write reg {} address {:x} value {}",
+            "unknown write reg {} address {:#x} value {}",
             reg,
             address,
             char::from_u32(value & mask).unwrap()
diff --git a/src/device/memory.rs b/src/device/memory.rs
index 192ada4..a5707d7 100644
--- a/src/device/memory.rs
+++ b/src/device/memory.rs
@@ -16,7 +16,7 @@ const MM_SI_REGS: usize = 0x04800000;
 //const MM_DOM2_ADDR1: usize = 0x05000000;
 pub const MM_DOM2_ADDR2: usize = 0x08000000;
 pub const MM_CART_ROM: usize = 0x10000000;
-const MM_PIF_MEM: usize = 0x1fc00000;
+pub const MM_PIF_MEM: usize = 0x1fc00000;
 //const MM_DOM1_ADDR3: usize = 0x1fd00000;
 const MM_IS_VIEWER: usize = 0x13ff0000;
 pub const MM_SC64_BUFFER: usize = 0x1ffe0000;
diff --git a/src/device/pi.rs b/src/device/pi.rs
index 2e94a50..c02826c 100644
--- a/src/device/pi.rs
+++ b/src/device/pi.rs
@@ -117,17 +117,24 @@ fn get_handler(address: u32) -> PiHandler {
         read: device::cart::rom::dma_read,
         write: device::cart::rom::dma_write,
     };
-    if address >= device::memory::MM_SC64_BUFFER as u32 {
+    if address >= device::memory::MM_SC64_BUFFER as u32
+        && address < (device::memory::MM_SC64_BUFFER + 0x2000) as u32
+    {
         handler.read = device::cart::sc64::dma_read;
         handler.write = device::cart::sc64::dma_write;
-    } else if address >= device::memory::MM_CART_ROM as u32 {
+    } else if address >= device::memory::MM_CART_ROM as u32
+        && address < device::memory::MM_PIF_MEM as u32
+    {
         handler.read = device::cart::rom::dma_read;
         handler.write = device::cart::rom::dma_write;
-    } else if address >= device::memory::MM_DOM2_ADDR2 as u32 {
+    } else if address >= device::memory::MM_DOM2_ADDR2 as u32
+        && address < device::memory::MM_CART_ROM as u32
+    {
         handler.read = device::cart::sram::dma_read;
         handler.write = device::cart::sram::dma_write;
     } else {
-        panic!("unknown pi handler")
+        handler.read = unknown_dma_read;
+        handler.write = unknown_dma_write;
     }
     handler
 }
@@ -197,3 +204,26 @@ pub fn dma_event(device: &mut device::Device) {
 
     device::mi::set_rcp_interrupt(device, device::mi::MI_INTR_PI)
 }
+
+fn unknown_dma_read(
+    device: &mut device::Device,
+    mut _cart_addr: u32,
+    mut _dram_addr: u32,
+    length: u32,
+) -> u64 {
+    device::pi::calculate_cycles(device, 1, length)
+}
+
+fn unknown_dma_write(
+    device: &mut device::Device,
+    mut _cart_addr: u32,
+    mut dram_addr: u32,
+    length: u32,
+) -> u64 {
+    dram_addr &= device::rdram::RDRAM_MASK as u32;
+
+    for i in 0..length {
+        device.rdram.mem[(dram_addr + i) as usize ^ device.byte_swap] = 0;
+    }
+    device::pi::calculate_cycles(device, 1, length)
+}
diff --git a/src/ui/storage.rs b/src/ui/storage.rs
index cf739c5..c10a72c 100644
--- a/src/ui/storage.rs
+++ b/src/ui/storage.rs
@@ -43,10 +43,10 @@ fn get_save_type(rom: &[u8], game_id: &str) -> Vec<SaveTypes> {
             1 => return vec![SaveTypes::Eeprom4k],
             2 => return vec![SaveTypes::Eeprom16k],
             3 => return vec![SaveTypes::Sram],
-            4 => panic!("Unsupported save type: {:X}", save_type),
+            4 => panic!("Unsupported save type: {}", save_type),
             5 => return vec![SaveTypes::Flash],
-            6 => panic!("Unsupported save type: {:X}", save_type),
-            _ => panic!("Unknown save type: {:X}", save_type),
+            6 => panic!("Unsupported save type: {}", save_type),
+            _ => panic!("Unknown save type: {}", save_type),
         }
     }
     match game_id {