Bally Pinball CPU Board ROM Numbers, sorted by ROM number.
On the top of every 1977 to 1985 Bally pinball black masked ROM there is a part number. The list below shows what pinball game this ROM part number goes to on the CPU board.
ROM #   : Game Used In
-------   ------------
E720-07 : U6 for Freedom.
E720-20 : U6 for Strikes and Spares, Eight Ball, Night Rider, 
           Black Jack, Evel Knievel, Mata Hari, Power Play.
E720-21 : U6 for ?
E720-28 : U6 for Lost World.
E720-30 : U6 for Playboy, SMDM, Super Sonic, KISS, Eight Ball, 
           Strikes and Spares, Paragon, Voltan.
E720-34 : U6 for Harlem Globetrotters (-35 only; Use with E750-7 & E750-8)
E720-35 : U6 for Dolly, Future Spa, Globetrotters, Groundshaker, Hot Doggin, 
           Mystic, Rolling Stones, Silverball, Space Invaders, Viking. 
E720-37 : U6 substitute for Space Invaders
E720-40 : U6 (9332) for Frontier, Skateball, Xenon.
E720-52 : U6 (9332) for EBD, Embryon, Fireball II.
E720-53 : U6 for BMX, Centaur, Electra, Fathom, Mr & Mrs Pac-Man, 
           Speak Easy, Spectrum, Vector.
E721-21 : Night Rider U1 2716 combo (Use w/E720-20 U6)
E722-17 : Evel Knievel U2
E723-14 : Eight Ball U1 (set 1)
E723-15 : Eight Ball U2 (set 1)
E723-16 : Eight Ball U4 (set 1)
E723-17 : Eight Ball U2 (solo w/U6)
E723-18 : Eight Ball U1 (set 2- use w/E723-16 U4)
E723-19 : Eight Ball U2 (set 2- use w/E723-16 U4)
E723-20 : Eight Ball U2 2716 combo (use w/E720-20 U6)
E724-25 : Power Play U2
E725-21 : Mata Hari U2
E728-32 : Blackjack U2
E729-18 : Sound ROM: KISS, SMDM, Lost World, Playboy, Super Sonic, Star Trek
E729-51 : Sound ROM: Dolly Parton, Paragon, Globetrotters, (others?)
E740-16 : Strikes & Spares U2 (use w/E720-20 U6)
E741-10 : Super Sonic U1
E741-08 : Super Sonic U2
E742-20 : SMDM U1
E742-18 : SMDM U2
E743-9  : Playboy U1
E743-10 : Playboy U2
E743-13 : Playboy U1 (opt 1- use with E743-10 U2)
E743-11 : Playboy U1 (opt 2)
E743-12 : Playboy U2 (opt 2)
E743-14 : Playboy U1 (opt 3- use with E743-12 U2)
E743-30 : Playboy U6
E744-03 : Voltan U1
E744-04 : Voltan U2
E745-11 : Star Trek U1
E745-12 : Star Trek U2
E746-3  : KISS U1 (v1)
E746-4  : KISS U2 (v1)
E746-5  : KISS U1 (v2)
E746-6  : KISS U2 (v2)
E746-11 : KISS U1 (v3)
E746-12 : KISS U2 (v3)
E748-15 : Paragon U2
E748-17 : Paragon U1
E750-3  : Harlem Globetrotters U1
E750-4  : Harlem Globetrotters U2
E750-5  : Harlem Globetrotters U1 (-35 only)
E750-6  : Harlem Globetrotters U2 (-35 only)
E750-7  : Harlem Globetrotters U1 (optional)
E750-8  : Harlem Globetrotters U2 (opt)
E776-8  : Nitro Groundshaker U1 (-35 only)
E776-9  : Nitro Groundshaker U2 (-35 only)
E776-10 : Nitro Groundshaker U1
E776-11 : Nitro Groundshaker U2
E776-14 : Nitro Groundshaker U4 Sound
E776-15 : Nitro Groundshaker U4 Sound (opt)
E776-17 : Nitro Groundshaker U1 substitute
E777-8  : Dolly Parton U1 (-35 only)
E777-9  : Dolly Parton U2 (-35 only)
E777-10 : Dolly Parton U1
E777-11 : Dolly Parton U2
E777-12 : Dolly Parton U2 (-35 only)
E777-13 : Dolly Parton U2 (opt)
E781-2  : Future Spa U4 Sound
E781-5  : Future Spa U4 Sound (opt)
E781-6  : Future Spa U1 (-35 only)
E781-7  : Future Spa U1
E781-8  : Future Spa U2 (-35 only)
E781-9  : Future Spa U2
E786-8  : Silverball Mania U4 Sound
E786-11 : Silverball Mania U4 Sound (This may be confused with a U1 MPU chip)
E786-14 : Silverball Mania U1 (-35 only)
E786-15 : Silverball Mania U6 (-35 only)
E786-16 : Silverball Mania U1 (-35 only- use w/E786-17 U2)
E786-17 : Silverball Mania U2
E792-2  : Space Invaders U4 Sound
E792-7  : Space Invaders U4 Sound (opt)
E792-8  : Space Invaders U1 (-35 only)
E792-10 : Space Invaders U1
E792-12 : Space Invaders U2 (-35 only)
E792-13 : Space Invaders U2
E796-11 : Rolling Stones U4 Sound
E796-15 : Rolling Stones U2 (-35 only)
E796-16 : Rolling Stones U1 (-35 only)
E796-17 : Rolling Stones U1
E796-18 : Rolling Stones U2
E796-19 : Rolling Stones U4 Sound (opt)
E811-22 : Xenon Voice ROM U1
E811-23 : Xenon Voice ROM U2
E811-24 : Xenon Voice ROM U3
E811-25 : Xenon Voice ROM U4
E811-26 : Xenon Voice ROM U5
E811-27 : Xenon Voice ROM U6
E811-28 : Xenon Voice ROM U7
E811-40 : Xenon U1
E811-41 : Xenon U2
E819-08 : Frontier U1
E819-07 : Frontier U2
E838-03 : Eight Ball Deluxe S&T sound ROM U4
E838-04 : Eight Ball Deluxe S&T sound ROM U3
E838-06 : Eight Ball Deluxe S&T sound ROM U5
E838-15 : EBD U2 ROM
E869-02 : Rapid Fire S&T sound ROM U5 (only ROM used on this board)
E869-03 : U6 for Rapid Fire
E872-06 : U2 for Mr & Mrs Pac-Man
E891-15 : U6 for Baby Pac-Man

The U2/U6 ROM software for EPROMs available here (bally 2716) and here (bally 2732) and here (stern). Below are the original ROM file names and numbers used in the 2732 ZIP file. This also gives an idea of which U6 ROMs are common between different games:

2732 U2 & U6 GAME ROM LIST 
GAME            U2 POSITION     U6 POSITION          
----            -----------     -----------
FREEDOM         FREE2732.U2     FREE2732.U6                               
NIGHT RIDER     NGHT2732.U2     720-2132.U6                  
EVEL KNIEVEL    EVEL2732.U2     720-2132.U6
EIGHTBALL       8BAL2732.U2     720-2132.U6
POWER PLAY      POWR2732.U2     720-2132.U6
MATA HARI       MATA2732.U2     720-2132.U6      
BLACK JACK      BLKJ2732.U2     720-2132.U6
STRIKES/SPARES  ST&S2732.U2     720-2132.U6 
LOST WORLD      LOST2732.U2     720-2832.U6
$6 MILLION MAN  6MI$2732.U2     720-3032.U6
PLAYBOY         PLAY2732.U2     720-3032.U6
VOLTAN          VOLT2732.U2     720-3032.U6
SUPERSONIC      SURP2732.U2     720-3032.U6
STAR TREK       STAR2732.U2     720-3032.U6
KISS            KISS2732.U2     720-3032.U6
PARAGON         PARA2732.U2     720-3032.U6
HARLEM GLOBE    HARL2732.U2     720-3532.U6
DOLLY PARTON    DOLL2732.U2     720-3532.U6
FUTURE SPA      FSPA2732.U2     720-3532.U6
NITRO GROUND    NITR2732.U2     720-3532.U6
SILVERBALLMANIA SILV2732.U2     720-3532.U6
SPACE INVADERS  INVA2732.U2     720-3532.U6 
ROLLING STONES  ROLL2732.U2     720-3532.U6
MYSTIC          MYST2732.U2     720-3532.U6
HOT DOGGIN      HOTD2732.U2     720-3532.U6
VIKING          VIKG2732.U2     720-3532.U6
SKATEBALL       SKAT2732.U2     720-4032.U6
FRONTIER        FRNT2732.U2     720-4032.U6
XENON           XNON2732.U2     720-4032.U6
FLASH GORDON    FLSH2732.U2     720-5232.U6
8 BALL DELUXE   8DEL2732.U2     720-5232.U6
FIREBALL II     FB2-2732.U2     720-5232.U6
EMRYRON         EMBY2732.U2     720-5232.U6
FATHOM          FATH2732.U2     720-5332.U6
MEDUSA          MDUS2732.U2     720-5332.U6
CENTAUR         CENT2732.U2     720-5332.U6
ELEKTRA         ELEK2732.U2     720-5332.U6
VECTOR          VECT2732.U2     720-5332.U6
MR/MRS PACMAN   MR&S2732.U2     720-5332.U6 
SPECTRUM        SPEC2732.U2     720-5332.U6
SPEAKEASY       EASY2732.U2     720-5332.U6
BMX             BMX-2732.U2     720-5332.U6
GRAND SLAM      GRNDSLAM.U2     GRNDSLAM.U6
GOLD BALL       GOLD2732.U2     720-5332.U6
X's & O's       X&OS2732.U2     720-5332.U6
SPY HUNTER      SPY-2732.U2     720-5332.U6
KINGS OF STEEL  KNGS2732.U2     720-5332.U6
BLACK PYRAMID   BLKP2732.U2     720-5332.U6
FIREBAL CLASSIC FB-CLASS.U2     720-5332.U6
CYBERNAUT       CYBE2732.U2     720-5332.U6

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