diff --git a/Makefile b/Makefile
index 9cb7b1a..b58f699 100644
--- a/Makefile
+++ b/Makefile
@@ -6,6 +6,7 @@ CFILES = src/main.c \
 		src/bus.c \
 		src/cpu.c \
 		src/framebuffer.c \
+		src/mouse.c \
 		src/screen.c
 
 $(TARGET): $(CFILES)
diff --git a/src/bus.c b/src/bus.c
index 208b3ec..3a3cac7 100644
--- a/src/bus.c
+++ b/src/bus.c
@@ -11,14 +11,16 @@
 #include "bus.h"
 #include "cpu.h"
 #include "framebuffer.h"
+#include "mouse.h"
 
 extern fox32_vm_t vm;
+extern mouse_t mouse;
 
 int bus_io_read(void *user, uint32_t *value, uint32_t port) {
     (void) user;
     switch (port) {
         case 0x80000000 ... 0x8000031F: { // overlay port
-            uint8_t overlay_number = (port & 0x000000FF);
+            uint8_t overlay_number = port & 0x000000FF;
             uint8_t setting = (port & 0x0000FF00) >> 8;
             switch (setting) {
                 case 0x00: {
@@ -49,6 +51,26 @@ int bus_io_read(void *user, uint32_t *value, uint32_t port) {
 
             break;
         };
+
+        case 0x80000400 ... 0x80000401: { // mouse port
+            uint8_t setting = port & 0x000000FF;
+            switch (setting) {
+                case 0x00: {
+                    // button states
+                    if (mouse.clicked) *value |= 0b001;
+                    if (mouse.released) *value |= 0b010;
+                    if (mouse.held) *value |= 0b100; else *value &= !0b100;
+                    break;
+                };
+                case 0x01: {
+                    // position
+                    *value = (mouse.y << 16) | mouse.x;
+                    break;
+                };
+            }
+
+            break;
+        };
     }
 
     return 0;
@@ -97,6 +119,27 @@ int bus_io_write(void *user, uint32_t value, uint32_t port) {
 
             break;
         };
+
+        case 0x80000400 ... 0x80000401: { // mouse port
+            uint8_t setting = port & 0x000000FF;
+            switch (setting) {
+                case 0x00: {
+                    // button states
+                    mouse.clicked = value & 0b001;
+                    mouse.released = value & 0b010;
+                    mouse.held = value & 0b100;
+                    break;
+                };
+                case 0x01: {
+                    // position
+                    mouse.x = value & 0x0000FFFF;
+                    mouse.y = (value & 0xFFFF0000) >> 16;
+                    break;
+                };
+            }
+
+            break;
+        };
     }
 
     return 0;
diff --git a/src/main.c b/src/main.c
index 245189a..f223494 100644
--- a/src/main.c
+++ b/src/main.c
@@ -10,6 +10,7 @@
 #include "bus.h"
 #include "cpu.h"
 #include "framebuffer.h"
+#include "mouse.h"
 #include "screen.h"
 
 #include "../fox32rom.h"
@@ -46,9 +47,9 @@ int main(int argc, char *argv[]) {
         draw_framebuffer,
         0,
         0,
-        0,
-        0,
-        0
+        mouse_pressed,
+        mouse_released,
+        mouse_moved
     );
 
     ScreenInit();
diff --git a/src/mouse.c b/src/mouse.c
new file mode 100644
index 0000000..7f22c79
--- /dev/null
+++ b/src/mouse.c
@@ -0,0 +1,36 @@
+#include <SDL2/SDL.h>
+#include <getopt.h>
+#include <math.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "mouse.h"
+#include "screen.h"
+
+mouse_t mouse;
+
+void mouse_moved(int dx, int dy) {
+    mouse.x += dx;
+    mouse.y += dy;
+
+    if (mouse.x > 0x8000) mouse.x = 0;
+    if (mouse.x > 640) mouse.x = 640;
+    if (mouse.y > 0x8000) mouse.y = 0;
+    if (mouse.y > 480) mouse.y = 480;
+}
+
+void mouse_pressed(int button) {
+    (void) button; // TODO: check which button was clicked
+    mouse.clicked = true;
+    mouse.held = true;
+}
+
+void mouse_released(int button) {
+    (void) button; // TODO: check which button was released
+    mouse.released = true;
+    mouse.held = false;
+}
diff --git a/src/mouse.h b/src/mouse.h
new file mode 100644
index 0000000..36fcd7d
--- /dev/null
+++ b/src/mouse.h
@@ -0,0 +1,12 @@
+#pragma once
+
+typedef struct {
+    uint16_t x, y;
+    bool clicked;
+    bool released;
+    bool held;
+} mouse_t;
+
+void mouse_moved(int dx, int dy);
+void mouse_pressed(int button);
+void mouse_released(int button);
diff --git a/src/screen.c b/src/screen.c
index 24372ec..3a300e1 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -111,7 +111,7 @@ int ScreenProcessEvents() {
             case SDL_MOUSEMOTION: {
                 if (ScreenMouseGrabbed) {
                     if (MainScreen.MouseMoved)
-                        MainScreen.MouseMoved(&MainScreen, event.motion.xrel, event.motion.yrel);
+                        MainScreen.MouseMoved(event.motion.xrel, event.motion.yrel);
                 }
                 break;
             }
@@ -127,14 +127,14 @@ int ScreenProcessEvents() {
                 }
 
                 if (MainScreen.MousePressed)
-                    MainScreen.MousePressed(&MainScreen, event.button.button);
+                    MainScreen.MousePressed(event.button.button);
                 break;
             }
 
 
             case SDL_MOUSEBUTTONUP: {
                 if (MainScreen.MouseReleased)
-                    MainScreen.MouseReleased(&MainScreen, event.button.button);
+                    MainScreen.MouseReleased(event.button.button);
                 break;
             }
 
@@ -149,12 +149,12 @@ int ScreenProcessEvents() {
                 }
 
                 if (MainScreen.KeyPressed)
-                    MainScreen.KeyPressed(&MainScreen, event.key.keysym.scancode);
+                    MainScreen.KeyPressed(event.key.keysym.scancode);
                 break;
 
             case SDL_KEYUP:
                 if (MainScreen.KeyReleased)
-                    MainScreen.KeyReleased(&MainScreen, event.key.keysym.scancode);
+                    MainScreen.KeyReleased(event.key.keysym.scancode);
                 break;
         }
     }
diff --git a/src/screen.h b/src/screen.h
index 2eb4328..70d3cdc 100644
--- a/src/screen.h
+++ b/src/screen.h
@@ -5,11 +5,11 @@
 struct Screen;
 
 typedef void (*ScreenDrawF)(struct Screen *screen);
-typedef void (*ScreenKeyPressedF)(struct Screen *screen, int sdlscancode);
-typedef void (*ScreenKeyReleasedF)(struct Screen *screen, int sdlscancode);
-typedef void (*ScreenMousePressedF)(struct Screen *screen, int button);
-typedef void (*ScreenMouseReleasedF)(struct Screen *screen, int button);
-typedef void (*ScreenMouseMovedF)(struct Screen *screen, int dx, int dy);
+typedef void (*ScreenKeyPressedF)(int sdl_scancode);
+typedef void (*ScreenKeyReleasedF)(int sdl_scancode);
+typedef void (*ScreenMousePressedF)(int button);
+typedef void (*ScreenMouseReleasedF)(int button);
+typedef void (*ScreenMouseMovedF)(int dx, int dy);
 
 struct Screen {
     int Width;