diff --git a/src/main.rs b/src/main.rs
index 9f2ee17..9ce4fa5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,7 +7,7 @@ use clap::{ArgGroup, Parser};
 use gilrs::Gilrs;
 use minifb::{Window, WindowOptions};
 use processor::{
-    memory::{rom::Rom, Memory},
+    memory::{Memory, Rom},
     Cpu,
 };
 use std::{
diff --git a/src/processor/memory.rs b/src/processor/memory.rs
index 1741309..25d4380 100644
--- a/src/processor/memory.rs
+++ b/src/processor/memory.rs
@@ -1,90 +1,18 @@
-use self::rom::Rom;
+use self::mmio::{Joypad, JoypadBank};
+pub use self::rom::Rom;
 use crate::{
-    processor::{clear_bit, get_bit, SplitRegister},
+    processor::{get_bit, SplitRegister},
     verbose_println,
 };
 use gilrs::{Button, ConnectedGamepadsIterator};
 use minifb::Key;
 use std::io::{stdout, Write};
 
+mod mmio;
 pub(crate) mod rom;
 
 pub(crate) type Address = u16;
 
-#[derive(Debug, Clone, Copy, PartialEq)]
-enum JoypadBank {
-    Action,
-    Direction,
-}
-
-#[derive(Debug, Clone, Copy, PartialEq)]
-struct Joypad {
-    bank_sel: JoypadBank,
-    down: bool,
-    up: bool,
-    left: bool,
-    right: bool,
-    start: bool,
-    select: bool,
-    b: bool,
-    a: bool,
-}
-
-impl Joypad {
-    fn as_register(&self) -> u8 {
-        let mut reg = 0xFF;
-        match self.bank_sel {
-            JoypadBank::Action => {
-                reg = clear_bit(reg, 5);
-                if self.start {
-                    reg = clear_bit(reg, 3);
-                }
-                if self.select {
-                    reg = clear_bit(reg, 2);
-                }
-                if self.b {
-                    reg = clear_bit(reg, 1);
-                }
-                if self.a {
-                    reg = clear_bit(reg, 0);
-                }
-            }
-            JoypadBank::Direction => {
-                reg = clear_bit(reg, 4);
-                if self.down {
-                    reg = clear_bit(reg, 3);
-                }
-                if self.up {
-                    reg = clear_bit(reg, 2);
-                }
-                if self.left {
-                    reg = clear_bit(reg, 1);
-                }
-                if self.right {
-                    reg = clear_bit(reg, 0);
-                }
-            }
-        }
-        reg
-    }
-}
-
-impl Default for Joypad {
-    fn default() -> Self {
-        Self {
-            bank_sel: JoypadBank::Action,
-            down: false,
-            up: false,
-            left: false,
-            right: false,
-            start: false,
-            select: false,
-            b: false,
-            a: false,
-        }
-    }
-}
-
 #[allow(dead_code)]
 pub struct Memory {
     bootrom: Vec<u8>,
diff --git a/src/processor/memory/mmio/joypad.rs b/src/processor/memory/mmio/joypad.rs
new file mode 100644
index 0000000..801ed0d
--- /dev/null
+++ b/src/processor/memory/mmio/joypad.rs
@@ -0,0 +1,75 @@
+use crate::util::clear_bit;
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub enum JoypadBank {
+    Action,
+    Direction,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Joypad {
+    pub bank_sel: JoypadBank,
+    pub down: bool,
+    pub up: bool,
+    pub left: bool,
+    pub right: bool,
+    pub start: bool,
+    pub select: bool,
+    pub b: bool,
+    pub a: bool,
+}
+
+impl Joypad {
+    pub fn as_register(&self) -> u8 {
+        let mut reg = 0xFF;
+        match self.bank_sel {
+            JoypadBank::Action => {
+                reg = clear_bit(reg, 5);
+                if self.start {
+                    reg = clear_bit(reg, 3);
+                }
+                if self.select {
+                    reg = clear_bit(reg, 2);
+                }
+                if self.b {
+                    reg = clear_bit(reg, 1);
+                }
+                if self.a {
+                    reg = clear_bit(reg, 0);
+                }
+            }
+            JoypadBank::Direction => {
+                reg = clear_bit(reg, 4);
+                if self.down {
+                    reg = clear_bit(reg, 3);
+                }
+                if self.up {
+                    reg = clear_bit(reg, 2);
+                }
+                if self.left {
+                    reg = clear_bit(reg, 1);
+                }
+                if self.right {
+                    reg = clear_bit(reg, 0);
+                }
+            }
+        }
+        reg
+    }
+}
+
+impl Default for Joypad {
+    fn default() -> Self {
+        Self {
+            bank_sel: JoypadBank::Action,
+            down: false,
+            up: false,
+            left: false,
+            right: false,
+            start: false,
+            select: false,
+            b: false,
+            a: false,
+        }
+    }
+}
diff --git a/src/processor/memory/mmio/mod.rs b/src/processor/memory/mmio/mod.rs
new file mode 100644
index 0000000..db3b2c8
--- /dev/null
+++ b/src/processor/memory/mmio/mod.rs
@@ -0,0 +1,2 @@
+mod joypad;
+pub use joypad::{Joypad, JoypadBank};