i dont know if it is ok send here my web page i have one
https://www.tigerhareram.cz/retroarch.html
watch my site and group
i have famicom games , famicom hacks and nes games collected as roms
so you can meaby write software to cartridge you know ?
need a writer machine what i dont have, only software
but about creating gaming machines
buy anbernic , odroid go , or raspberry pi gpi case or other . this is for handhelds
next step will be install linux to pc machines (my tigerhareram or Batocera linux)
read my tutorial navody.pdf at web site in download.1 files
share my stuff can be profitable for example by m.a.m.e. what i have v0.185
beware , in my tigerhareram linux , in game diablo is win virus what not attacking linux
but kill windows
my tigerhareram.cz can be used as reference set for many types arcade computer consoles and handhelds
include famicom
downloads
JIVA's RetroArch
JIVA's Attract Mode
JIVA's M.A.M.E.
JIVA's DOSBox
raspberry
and linux