Electrocop

Developed by ICC for Atari.  One of the more famous MIA 7800 prototypes, Electrocop was complete and shown at the CES show but ultimately unreleased.  The whereabouts of this game are currently unknown.  It is believed that this version of the game differed from the version that was released on the Atari Lynx.

 

Elevator Action

Port of the 1983 Taito Coin-Op of the same name.  Internal memos state that Elevator Action was 80% complete and scheduled to be shown at the June 1984 CES show.  It is unknown if the game was actually demoed at the show or not.

 

Gauntlet

Once in development by Hewson, it is rumored that the game was nearly complete before being canceled for unknown reasons.

 

Moon Patrol

Port of the 1983 Williams Coin-Op.  Confirmed to have been finished, but ultimately went unreleased.  According to internal memos, marketing was still figuring out how to sell the game.

 

Road Riot 4WD

Port of the 1991 Atari Coin-op.  According to internal memos this game was ready to be released.  It is unknown if any prototypes of this game still exist.

 

Skyfox

Based on the 1984 Electronics Arts game of the same name.  Although Skyfox was shown in 7800 advertisements and even on the 7800 box, the game was never finished.  A simple one screen demo was found on a developers hard drive in the early 90's, but this demo has not been seen since.

 

Steel Talons

Port of the 1991 Atari Coin-op.  According to internal memos, the game was virtually complete but it was decided to cancel it due to the death of the 7800.

 

Tempest

Listed as being 15% on an internal Atari memo, it is unknown if coding continued on this title past the 84 shutdown.

 

Toki

Port of the 1989 TAD Corp. Coin-op.  According to internal memos this game was very close to being complete, but was cancelled due to the death of the 7800.