I don't have problems with old hardware, take for example the Nintendo Wii, the quickest method for mod it just require a SD Card, pretty few archives and if you have no problems the process can take as few as 10 minutes, and besides the backups for DVD games you can put the Wii up as if is still 2010, the online for most games were put back thank you to fans, you can install the Wiiware games, there multimedia and emulators for most 90s stuff, the Wii Channels were there used to be a community are up again and more much stuff with zero risk of ban because Nintendo discontinued the service years ago.
About stuff for improve the image quality, I am fine with it but some of these mods are really pricey, like the HDMi N64 one for example.