Choose your exact USA ROM and separate 64-byte IPL firmware. Files are processed locally. This diagnostic plays sound; physical controls and sustained playback still need verification.
Browser storage is checked after the game loads. Export checkpoints for a separate backup.
Checkpoint recovery is experimental. Import requires the same game and core build. A successful import leaves the game paused.
Waiting for local files.
Arrow keys: move. Z / X / A / S: B / A / Y / X. Q / W: L / R. Enter: Start. Shift: Select. Standard gamepads support two players. Click the game to focus. Changing tabs or disconnecting a controller pauses and releases every button.
No playback measurements yet.