via http://www.aep-emu.de/

Marat Fayzullin has ported his (free) MSX emulator fMSX to the Android platform: fMSX for Android

Quote:
* Added new semi-transparent virtual joystick. Use Settings to configure, or go back to the old joystick.
* Added optional persistent fast-forwarding.
* Added assignment options for diagonal buttons.
* Made tactile feedback strength configurable.
* Made user-assigned key mappings override default key mappings.
* Xperia Play [X] button now acts as FIRE-A (was START before).