actually turn off bootrom LOL

src/main.rs

@@ -178,7 +178,10 @@ impl Memory {
                 }
                 self.io[(address - 0xFF00) as usize] = data;
             }
-            0xFF4C..0xFF80 => {
+            0xFF50 => {
+                self.bootrom_enabled = false;
+            }
+            0xFF4C..0xFF50 | 0xFF51..0xFF80 => {
                 // println!("empty space 2 write: {:#X} to addr {:#X}", data, address);
             }
             0xFF80..0xFFFF => {