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Beginning with their first games in 1977, STERN pinballs used an MPU board which was virtually identical to the Bally brand MPU board at that time, the 2518-17 or early board. Stern called their board the MPU-100 and it was so close that that you can run all the early Bally games on the MPU-100 and all the STERN early games will run on the Bally 2518-17 (DASH SEVENTEEN). The numbering system which STERN used to identify the GAME ROMs was simple; every chip starts with the prefix "25A-ROM-P" and then a number which tells you everything you need to know. The following list shows the number, game name and location (U2 or U6) for all the early STERN GAMES. Note that a few chips are used for more than one game.

• 25A-ROM-P 1 . . . . . . . Stingray U2
• 25A-ROM-P 1 . . . . . . . 'Pinball' U2
• 25A-ROM-P 2 . . . . . . . Stingray U6
• 25A-ROM-P 2 . . . . . . . 'Pinball' U6
• 25A-ROM-P 3 . . . . . . . Stars U2
• 25A-ROM-P 4 . . . . . . . Stars U6
• 25A-ROM-P 5 . . . . . . . Memory Lane U2
• 25A-ROM-P 6 . . . . . . . Memory Lane U6
• 25A-ROM-P 7 . . . . . . . 'Lectronomo U2
• 25A-ROM-P 7 . . . . . . . Nugent U2
• 25A-ROM-P 8 . . . . . . . 'Lectronomo U6
• 25A-ROM-P 8 . . . . . . . Nugent U6
• 25A-ROM-P 9 . . . . . . . Dracula U2
• 25A-ROM-P 9 . . . . . . . Wildfyre U2
• 25A-ROM-P 10 . . . . . . Wildfyre U6
• 25A-ROM-P 10 . . . . . . Dracula U6
• 25A-ROM-P 11 A . . . . Trident U2
• 25A-ROM-P 12 A/U . . Hot Hand U6
• 25A-ROM-P 12 A . . . . Trident U6
• 25A-ROM-P 12 A/U . . Majic U6
• 25A-ROM-P 13 . . . . . . Hot Hand U2
• 25A-ROM-P 14 . . . . . . Majic U2
• 25A-ROM-P 15 . . . . . . Genisis Shuffle U2
• 25A-ROM-P 16 . . . . . . Genisis Shuffle U6

STERN's second series of games used their MPU-200. This board looks very much like the MPU-100, except that it has an additional 5101 RAM chip added at the bottom of the board. The MPU-200 board is capable of running every STERN game AND every BALLY game of that era, early and late. The following list shows the number, game name and location (U2 or U6) for all the late STERN GAMES. THESE GAMES WILL ONLY RUN ON THE MPU-200 BOARD!

The first three games in this series continued to use the early numbering system, but this was abandoned in favor of simply writing the name of the game and the chip location on the chip label. All of these games use four GAME ROMS unless otherwise noted.

• 25A-ROM-P 25 . . . . . . . Galaxy U1
• 25A-ROM-P 26 . . . . . . . Galaxy U2
• 25A-ROM-P 27 . . . . . . . Galaxy U5
• 25A-ROM-P 28B . . . . . . Galaxy U6
• 25A-ROM-P 29 . . . . . . . Ali U1
• 25A-ROM-P 30 . . . . . . . Ali U2
• 25A-ROM-P 31 . . . . . . . Ali U5
• 25A-ROM-P 32 . . . . . . . Ali U6
• 25A-ROM-P 33 . . . . . . . Big Game U1
• 25A-ROM-P 34 . . . . . . . Big Game U2
• 25A-ROM-P 35 . . . . . . . Big Game U5
• 25A-ROM-P 36 . . . . . . . Big Game U6

The complete list of MPU-200 games in alphabetical order:

• Ali
• Big Game
• Black Beauty (U1, U5, & U6 only: No U2 chip used!)
• Catacomb
• Cheetah
• Dragon Fist
• Flight 2000
• Free Fall
• Galaxy
• Iron Maiden
• Lightning
• Meteor
• Nine Ball
• Orbitor
• Quicksilver
• Seawitch
• Split Second
• Star Gazer