diff --git a/frontend/src/app.rs b/frontend/src/app.rs
index e091d7a..e77fc3d 100644
--- a/frontend/src/app.rs
+++ b/frontend/src/app.rs
@@ -115,12 +115,8 @@ impl eframe::App for App {
                 self.file.open();
             }
 
-            if ui.button("Save file").clicked() {
-                self.file.save("test.txt", vec![0, 1, 2, 3, 33]);
-            }
-
             if let Some(file) = self.file.get() {
-                println!("{:#?}", file);
+                let _ = std::mem::replace(&mut self.emu, Megadrive::new(file));
             }
         });
 
diff --git a/frontend/src/widgets/file.rs b/frontend/src/widgets/file.rs
index b70a41b..d32ad92 100644
--- a/frontend/src/widgets/file.rs
+++ b/frontend/src/widgets/file.rs
@@ -9,7 +9,7 @@ use wasm_bindgen::JsCast;
 #[cfg(target_arch = "wasm32")]
 use web_sys::{window, Url, File, HtmlInputElement, FileReader};
 #[cfg(target_arch = "wasm32")]
-use js_sys::{Uint8Array, Array};
+use js_sys::{Uint8Array, Array, ArrayBuffer};
 
 
 #[cfg(target_arch = "wasm32")]