diff --git a/src/device/pi.rs b/src/device/pi.rs
index d7437581..13fac556 100644
--- a/src/device/pi.rs
+++ b/src/device/pi.rs
@@ -122,8 +122,9 @@ pub fn get_handler(address: u32) -> PiHandler {
     };
     if address >= device::memory::MM_CART_ROM as u32 {
         if address >= device::memory::MM_DOM1_ADDR3 as u32 {
-            panic!("unimplemented handler")
-        //RW(cart, cart_dom3);
+            // this should result in all 0's being read/written
+            handler.read = device::cart_rom::dma_read;
+            handler.write = device::cart_rom::dma_write;
         } else {
             handler.read = device::cart_rom::dma_read;
             handler.write = device::cart_rom::dma_write;
diff --git a/src/device/tlb.rs b/src/device/tlb.rs
index 32108616..8574c8c2 100644
--- a/src/device/tlb.rs
+++ b/src/device/tlb.rs
@@ -238,9 +238,11 @@ pub fn tlb_map(device: &mut device::Device, index: u64) {
 
 pub fn get_physical_address(
     device: &mut device::Device,
-    address: u64,
+    mut address: u64,
     access_type: device::memory::AccessType,
 ) -> (u64, bool, bool) {
+    address &= 0xffffffff;
+
     if access_type == device::memory::AccessType::Write {
         if device.cpu.cop0.tlb_lut_w[(address >> 12) as usize].address != 0 {
             return (