@BobHarris Of course they need to read first, minimum requirements are MAME romset from at least 2006 (advance mame linux) and a FBA romset with CPS3 games runs well.

Retro CM3 can be my first option for arcade only games and I'll be ok, and then wait for CM4 for better performance and add home port consoles of PSP and Dreamcast home and their based arcade boards.

I can wait for Raspberry Pi 4 Module in mid 2020 at least.

Nintendo Switch Lite its a plan B one...also I will buy an ipega with gamepad to make my recent smartphone or my 2017 one looks like a Vita but with Android.