I have a Gemini too! I still use it sometimes, I just open Termux and use it as a highly portable scratch pad for working on small coding projects.
I wish that the handheld form factor had more options, but it seems that market is just too niche and otherwise dominated by tablets and phones.
https://www.www3.planetcom.co.uk/gemini-pda
Got mine in 2017 from their Indiegogo launch and as a previous 5mx user in the 90s how could I not?
Sadly they never updated the OS so it's not really much use now. The inability to make some android apps flip to landscape was also a little frustrating.