This looks a bit old, but this person apparently successfully ported the real Space Invaders arcade game to a TRS-80 Model 4/4P with hi-res board (the board being the x-factor here and something few of us with TRS-80 collections have (I don't)).

Pretty extraordinary stuff and as the author says, probably the first of its kind ever attempted. As we know, someone did something similar on the far more capable (though no less impressive of a technical achievement) TRS-80 Color Computer 3 with arcade Donkey Kong.

Keep in mind that the Model 4 came out in 1983, based off of a platform first released in 1977, and the Color Computer 3 came out in 1987, based off of a platform first released in 1980!

Zaxxon for the Apple II: Is it really a bad thing that this version of the game is not arcade perfect?It used to be that home videogame or computer translations of arcade games were judged on how closely they mimicked the source material. This included how many levels were brought over - memory constraints often meant that one or more stages were left on the cutting room floor (Donkey Kong translations were rarely complete, for instance) - how accurate the graphics and animation were (did Pac-Man look like Pac-Man?), whether or not the sound captured the intended spirit (did Asteroids provide enough of a bass effect?), and how well the controls matched up (like angling the joystick for Q*bert), among many other areas.