The Last Starfighter 5-8-84
This is a very late beta of The Last Starfighter. The only difference is in the code for clearing the screen when the game changes screens. In this version the game clears the playfield first and then the Player Missile Graphics whereas in the final version the game clears the PGM first then the playfield. This results in some of the PMG being visible briefly when switching screens. The rest of the game is exactly the same.
A big thanks to Kr0tki for going through the code and figuring this out.