RPL is great, they kept making the 50G (which was basically emulating the custom CPU from the 48G on an ARM microcontroller) up until 2015. You could even make

RPL is great, they kept making the 50G (which was basically emulating the custom CPU from the 48G on an ARM microcontroller) up until 2015. You could even make your own simple GUIs, I wrote a few that I used a lot in school. A resistor color calculator and some statistics-related ones.