feat: more instructions

examples/sdl/src/main.rs

@@ -4,7 +4,7 @@ fn main() {
     let mut game_boy = GameBoy::new();
     game_boy.load_boot_default();
 
-    for i in 0..24612 {
+    for i in 0..24650 {
         game_boy.clock();
         if game_boy.cpu().pc() >= 0x3032 {
             println!("{}", i);

src/cpu.rs

@@ -619,7 +619,7 @@ impl Cpu {
 
     #[inline(always)]
     fn push_byte(&mut self, byte: u8) {
-        self.sp -= 1;
+        self.sp = self.sp.wrapping_sub(1);
         self.mmu.write(self.sp, byte);
     }
 
@@ -632,7 +632,7 @@ impl Cpu {
     #[inline(always)]
     fn pop_byte(&mut self) -> u8 {
         let byte = self.mmu.read(self.sp);
-        self.sp += 1;
+        self.sp = self.sp.wrapping_add(1);
         byte
     }
 

src/mmu.rs

@@ -81,7 +81,7 @@ impl Mmu {
                 }
                 0xf00 => {
                     if addr >= 0xff80 {
-                        self.ram[(addr & 0x7f) as usize]
+                        self.hram[(addr & 0x7f) as usize]
                     } else {
                         println!("WRITING TO IO control");
                         0x00
@@ -137,7 +137,6 @@ impl Mmu {
                 }
                 0xf00 => {
                     if addr >= 0xff80 {
-                        println!("WRITING TO Zero page");
                         self.hram[(addr & 0x7f) as usize] = value;
                     } else {
                         println!("WRITING TO IO control");