I had no problem playing Yar's Revenge on my Pandora. I did have difficulty playing Venture because on the map screen your character is represented by a single red pixel, and the Pandora's screen seems to have very slow response in the red, so that if you move it it pretty much disappears and you can only see where you are when you stop. However, that didn't stop me enjoying the game because the map screen is rarely frantic, and you only needed to make you way to a room to become a much larger icon. But that was played using panmame not a home console emulator.
I don't think I've played amidar, and I plan to test Venture on the Pyra screen when I get the chance.