@alphabetapie
However, I find there are large gaps in my collection from the Mame 0.78 and the most current release. For example, I don't have games like Mad Dog McGee, Mortal Kombat 4, Space Invaders and many others in this set. And those are some of my essentials. I tried bringing over the games from the new sets, but again, they fail to load.
space invaders is in 0.78 (invaders.zip), mad dog mcree no, mk4 no.
I tried bringing over the games from the new sets, but again, they fail to load.
of course. anything not in the 0.78 romset will not work, ever :) if you want to use later games, then you need to find out which of the supported MAMEs (or fbneo) supports them (check the gamelists or DATs), acquire the relevant set, transfer to your pi, and install and associate the relevant emulator with the rom via https://retropie.org.uk/docs/Runcommand