A lot of games didn't make it to the stores, because of all sorts of reasons. This is one of them and is yet another late-era NES announced game that never saw the light of day.
Gregg Tavares worked on the game for Virgin Games in 1993. He was told that although the game would probably not get a USA release, it would probably be available in Europe. Unfortunately, it didn't get a release there either.
COMMENTS BY GREGG TAVARES
"I made Robocop Vs. Terminator for Interplay. It was a very very bad game. The artists on that game couldn't deal well with the limits of the NES so it looks very bad and the designer was a recently promoted playtester and he didn't really know what he was doing. My attitude was that I would pretty much do what I was told (since I was doing it as a contract) and so I didn't push any design issues. At the time they told me it probably wouldn't ship in the United States but it might ship in Europe. "
/ Gregg Tavares
Although Tavares himself didn't even keep a working copy of the source code to the game, another source has come up with (as far as I can see) a fully completed, playable to the end copy of the game! And now it's been dumped and can be played on a NES emulator.
The game itself doesn't deviate too greatly from the standard; as RoboCop you have to shoot, run and jump your way through a futuristic wasteland of junkyards and factories. Your main weapon is your basic gun, which you can shoot in 8 directions and while you're hanging off of pipes or on ladders.
You'll face bosses from the Terminator flicks in between levels. Keep in mind that the direct approach is definitely not the best approach with these superrobots; the T800 after the first level is only mildly fazed by your gunfire. To kill him, you have to knock him from platform to platform with your fire until you eventually knock him off a conveyor belt into the acid vats at the bottom of the screen.
Although it won't break and records, Robocop Vs. Terminator is a pretty fun platform shooter and I'm sure it'll give you a bit of fun... and another bit of presumed-lost NES history.
Use a NES emulator to play this game. (NESticle seems to have some scrolling problems after the first level).