Fix segfault on linux

src/emulator/display.rs

@@ -41,10 +41,10 @@ impl TextBuffer {
 
 async fn run_handle(buffer: BufferPtr) {
     let mut opts = WindowOptions::default();
-    opts.scale = Scale::FitScreen;
-    opts.scale_mode = ScaleMode::AspectRatioStretch;
+    // opts.scale = Scale::FitScreen;
+    opts.scale_mode = ScaleMode::UpperLeft;
     opts.resize = true;
-
+    
     let mut window =
         minifb::Window::new("f8ful", WIDTH, HEIGHT, opts).expect("should be able to create window");
     let mut fb = [0x00000000; WIDTH * HEIGHT];
@@ -58,6 +58,7 @@ async fn run_handle(buffer: BufferPtr) {
                 let char_x = x / 8;
                 let char_y = y / 16;
                 let char_idx = char_x + char_y * WIDTH / 8;
+                let character = 0x10;
                 let character = unsafe { (*buffer.0)[char_idx] };
 
                 let font_addr = ((character as usize) << 4) + font_y;
@@ -71,6 +72,7 @@ async fn run_handle(buffer: BufferPtr) {
 
         window
             .update_with_buffer(&fb, WIDTH, HEIGHT)
-            .expect("should be able to update window");
+            .expect("unable to write to window");
     }
+
 }