In between hacking on the hardware, I've also been teaching myself the Rust programming language. I'm using this opportunity to try and fix some long-standing design issues with the original C-based code. One of those issues is the lack of a user interface that supports inserting and removing SD cards. I wrote some code to produce a quick mock-up of what I'd like to see. The top bar of the window contains icons which lets you insert or remove SD cards (the left icon represents an empty SD slot, while the right indicates an occupied SD slot), along with a simple performance status bar. The large black space, obviously, represents the 640x480 pixel output of the MGIA or CGIA core.

The user interface library is independent of the emulator project as a whole, but nonetheless written to support it. It's currently modelled after the Commodore 64/128 version of GEOS. Maybe as time progresses, I can evolve it to support more functionality from the GEM user interface.