more roms to play with

egui now renders the video correctly

gemma/src/chip8/video.rs

@@ -43,13 +43,15 @@ impl Chip8Video {
 
     pub fn poke(&mut self, address: u16, new_value: bool) -> Self {
         trace!("OFFSET: {address} - POKING {new_value}");
-        let effective_address = if address > 2048 {
+        let effective_address = if address >= 2048 {
             address - 2048
         } else {
             address
         };
         let old_value = self.memory[effective_address as usize];
-        if old_value != new_value {
+        let value_to_poke = new_value ^ old_value;
+
+        if old_value != value_to_poke {
             trace!("**VIDEO** TOGGLING");
             self.has_frame_changed = true;
         } else {
@@ -97,6 +99,10 @@ impl Chip8Video {
 
         output
     }
+
+    pub fn tick(&mut self) {
+        self.has_frame_changed = false;
+    }
 }
 
 impl Default for Chip8Video {