On-screen keypad (multi-touch requires Android 2.0 or later), as well as shortcut buttons such as load/save.
The emulator can be controlled using external USB/Bluetooth controllers, keyboard, touchscreen or trackball. This is by far the only emulator that supports link cable emulation with decent speed. MegaZ 3DS is a super fast and full-featured emulator to run GameBoy 3DS and Advanced games on the broadest range of Android devices, from very low-end phones to modern tablets.
