I wanted to keep the system as close to the original as possible, but some extensions such as increasing the available memory space and screen resolution would

I wanted to keep the system as close to the original as possible, but some extensions such as increasing the available memory space and screen resolution would be nice even for the original system. It would also be interesting to implement the early ideas for a JIT compiler. Starting with Squeak is probably the easier way if you want advanced features such as color or network connectivity - still, there might be some interesting ideas to improve the system. One idea I had was to accelerate the bitblit functions using the Raspberry Pi's GPU. Currently, crosstalk uses a simple framebuffer and the runtime has to convert all monochrome bitblit operations into color ones since the Raspberry GPU doesn't have a 1bpp mode. Support for multiple cores (available in all but the most simple Raspberry Pis) would also be nice. Here, the Roar system (https://github.com/smarr/RoarVM https://github.com/smarr/RoarVM) might be an interesting starting point. Let's see if I can find some students who want to work on some of these tasks... but my students are nowadays rather interested in Rust and RISC V :) (though a port of crosstalk to the Allwinner D1/Nezha and related boards and JH7110/Vision Five 2 is on my to-do list).