diff --git a/src/main.rs b/src/main.rs
index 58ab33e..050ab79 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -71,12 +71,16 @@ fn main() {
         .exit_on_esc(true).graphics_api(OpenGL::V3_2).build().unwrap();
     let mut event_settings = EventSettings::new();
     event_settings.max_fps = 60;
+    event_settings.ups = 107400;
     let mut events = Events::new(event_settings);
     let mut glyphs = get_glyphs(&mut window);
 
     // Main loop
     let mut run = false;
     while let Some(event) = events.next(&mut window) {
+        if let Some(_) = event.update_args() {
+            if run { cpu.clock(&mut bus); }
+        }
         if let Some(_) = event.render_args() {
             render(&mut window, &event, &mut glyphs, &cpu, &bus, &disasm);
         }
diff --git a/src/nes/cpu.rs b/src/nes/cpu.rs
index 86c2672..bd34154 100644
--- a/src/nes/cpu.rs
+++ b/src/nes/cpu.rs
@@ -454,8 +454,12 @@ impl CPU {
         unimplemented!()
     }
 
-    fn op_INC<T: Memory>(&mut self, bus: &T, val: Word) {
-        unimplemented!()
+    fn op_INC<T: Memory>(&mut self, bus: &mut T, addr: Word) {
+        let val = self.readb(bus, addr);
+        let val = val.wrapping_add(1);
+        self.writeb(bus, addr, val);
+        self.set_flag(ZERO, val == 0);
+        self.set_flag(NEGATIVE, (val & 0x80) != 0)
     }
 
     fn op_INX<T: Memory>(&mut self, bus: &T) {