GimliDS is a C64 Emulator for the DS/DSi, developed by Dave Bernazzani. GimliDS is based on the Frodo emulator from Christian Bauer. You can load a .d64 file via the DISK ICON and you can use SELECT for a Joystick swap. You can use the L/R shoulder buttons with the D-Pad to scale and offset the screen to get it to look as good as you can.