Browse the gallery and select one of the proposed roms or programs.
Load a ROM file ("*.rom"), a GT1 file ("*.gt1"), or a virtual
sd card file ("*.vhd") using the file selection box.
Drag and drop a ROM file, a GT1 file, or a VHD file onto the emulation window.
Load GT1 files from the virtual sd card. How to do this depends on the rom.
The main menu of the default rom (`dev128k7.rom`) offers a program `SpiCard`
for this purpose. Other modern roms can boot a similar program named `System.gt1`
on the sd card. Just long-press the `Start` button to make it happen.