MLB Jam? Power Up Baseball (arcade prototype) in MAME with Trackball controller
Gameplay footage of a full 9-inning game of Power Up Baseball running in MAME controlled with a trackball. The game requires 5 buttons so I am actually holding an SNES style controller in my left hand. I have the sensitivity jacked up so fielding is somewhat possible. There is a lot going on in this game and the pace is relentless. It can be played with analog controller if you can find some good settings.
This was a joint effort between Midway and Incredible Technologies meant to be an over-the-top baseball game similar to NBA Jam. They eventually decided that the trackball required too much intense effort so they made a joystick version but that version has not been discovered.
You can learn more about the recently uncovered prototype here:
https://gamehistory.org/powerupbaseball/