video region mode

emu/src/lib.rs

@@ -109,7 +109,7 @@ impl Megadrive {
 
         self.core.execute(3420-588);
 
-        for _ in screen_height..262 {
+        for _ in screen_height..262 { // TODO: PAL scanlines
             self.core.execute(3420);
         }
     }

emu/src/mem.rs

@@ -37,7 +37,7 @@ impl Mem {
             0xA11100..=0xA112FF => self.z80.ctrl_read(address) as _,
             0xC00000..=0xDFFFFF => self.vdp.read(address),
             0xFF0000..=0xFFFFFF => self.ram[address as usize & 0xFFFF] as _,
-            _ => todo!("read byte {:X}", address),
+            _ => 0, //todo!("read byte {:X}", address),
         }
     }
     pub fn read_u16(&self, address: u32) -> u32 {
@@ -67,7 +67,7 @@ impl Mem {
             0xFF0000..=0xFFFFFF => {
                 self.ram[address as usize & 0xFFFF] = value as u8;
             },
-            _ => todo!("write byte {:X} {:X}", address, value),
+            _ => (), //todo!("write byte {:X} {:X}", address, value),
         }
     }
     pub fn write_u16(&mut self, address: u32, value: u32) {

emu/src/rom.rs

@@ -39,5 +39,6 @@ impl ROM {
     pub fn serial_number(&self) -> String { self.read_string(0x180..0x18E) }
     pub fn checksum(&self) -> u16 { self.read_word(0x18E) }
     pub fn device_support(&self) -> String { self.read_string(0x190..0x1A0) }
+    pub fn region(&self) -> String { self.read_string(0x1F0..0x1F3) }
 
 }

frontend-minimal/src/lib.rs

@@ -10,7 +10,9 @@ impl MDEmu {
     #[wasm_bindgen(constructor)]
     pub fn new() -> MDEmu {
         MDEmu(Megadrive::new(
-            include_bytes!("/home/cake/sonic/roms/s1p.bin").to_vec()
+            // include_bytes!("/home/cake/sonic/roms/s1p.bin").to_vec()
+            // include_bytes!("/home/cake/sonic/roms/s2.bin").to_vec()
+            include_bytes!("/home/cake/Genesis/Sonic The Hedgehog 3 (E) [!].bin").to_vec()
         ))
     }