You should check out what the homebrew scene has made. I bought an old system, and garbage picked a CRT, just to play them. Started with Medieval Mayhem, a Warlords remake closer to the arcade version. Then I went on a years long obsession. Champ Games makes great stuff and has taken over distribution of some games AtariAge doesn't do since "Atari" bought them.

Someone ported Thrust in 2002: https://www.youtube.com/watch?v=EeQCIDCod8c

It's quite a feat.