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| 1982

Release type:
Units produced: Gottlieb
Controls/Input Device: Control(trackball), Buttons(2)
Number of Players: 1
More Creator:
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License from/Copyright:
SoundMix: Mono
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Reactor VGMuseum Game Endings
Reactor on CAESAR
Reactor high score and replay at MARP
Reactor on datObase
MAME folder name: reactor

Display: raster 256x240 @ 61.42Hz (61.42 pixclock)
Sound: 1 channels

Emulated in MAME via driver gottlieb.c:
Status: good; Emulation: good
Graphic: good; Sound: good; Color: good
Palette size: 16; Savestate: unsupported

fg0 with 4096kb
sha1:dba9aa0fec8b720a33d78b3dd1d7f74040048f7e crc:d1f20e15
fg1 with 4096kb
sha1:39d90a842a03091414ed58d4128b524ecc20c9f1 crc:18396c57
fg2 with 4096kb
sha1:f4bbaaa8cd881dc164b118d1e516edeeea54c1d8 crc:5489605a
fg3 with 4096kb
sha1:f868259b97675e58b6a7f1dc3c2a4ecf6aa0570e crc:8416ad53
rom0 with 4096kb
sha1:37ed60386935741e8cc0b8750bfcdf6f54c1bf9e crc:55930aed
rom1 with 4096kb
sha1:6b487f1cb405e2ba9345190e8ab6022c790882c1 crc:944e1ddf
rom2 with 4096kb
sha1:4d3b894821a2cff0ef55cec2b1f62f2e33009b4d crc:3caba35b
rom3 with 4096kb
sha1:baa7ef7309aab9b382442b25ede5d7ecd6e2c370 crc:f8881385
rom4 with 4096kb
sha1:3a94952c2830c7bea126cf39b84108936d96dc0e crc:0155daae
rom5 with 4096kb
sha1:52af7164dc59b9f7d8a1b3ef9d4c1fc81496899f crc:d90576a3
rom6 with 4096kb
sha1:b94272457e6a2d0ec46b510d71d69b4ab92a44aa crc:6ed841f3
rom7 with 4096kb
sha1:9ffce668c6f0155568ccb62a6f12a9513f3c513f crc:a62d86fd
snd1 with 2048kb
sha1:3c383076c68a929f96d844e89b09f3075f331906 crc:d958a0fd
snd2 with 2048kb
sha1:a449fcfb25521a0e7523184518b5204dac56e5f8 crc:5dc86942
Mameinfo.dat entry:
0.37b10 [Yochizo]


- 0.147u2: hap fixed clone Omega Fighter Special. The game fails to boot or finish post. After showing bad rom errors, the game resets.

- 0.147u1: Fixed maincpu rom loading.

- 0.122u7: Fixed gfx1/2/3/4/5 rom loading.

- 0.89u3: Changed Z80 CPU2 clock speed to 5MHz.

- 0.37b10: Yochizo added 'Omega Fighter' (UPL 1989) and clone Omega Fighter Special.

- 21st November 2000: Yochizo fixed some graphics bugs in the Omega Fighter / Atomic Robo-kid driver.

- 8th November 2000: Yochizo sent in a driver for Omega Fighter and Atomic Robo-kid.

- 25th April 1999: Dumped Omega Fighter Special.

LEVELS: 8 (restarts once)

Other Emulators:

* FB Alpha


* Raine

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Romset: 2016 kb / 8 files / 457.8 zip

Credits Mameinfo and Mametesters Project Robert J. Rabgno et al.
History.dat entry:
Reactor (c) 1982 Gottlieb.

The player controls a cursor that can move freely within a screen-sized arena, the nuclear reactor. The center contains a sun-type gravitational power source, the slowly overheating reactor core. The surrounding wall or the sun, if touched results in death. The cursor is controlled with a trackball by the player, who has to roll it fast in one direction in order to overcome the momentum of gravitation imposed by the sun. Swarms of enemy objects named after various radioactive particles float around in the reactor arena, obeying simple physical laws. These enemies can freely bounce into the walls at low speeds, have a repulsive force against each other and actively attack the player cursor. Boss types often break up into several smaller particles.

The object is to survive the sun and walls while gaining the highest score possible. It takes a delicate touch. Rather than moving the cursor/avatar left, right, up and down as in many arcade games, it is controlled by gravity and moves freely; with the player only being able to accelerate it rather than control its movements directly. Meanwhile the enemy particles are getting so aggressive that it can get very difficult to avoid being pulled in by the sun or touching a wall.

The basic gameplay consists of accelerating the cursor just at the right times so that it circles the reactor core with enough speed to have control via its own momentum when the enemy particles try to knock it off course, and then to place decoys and actually use the acceleration of the ball itself to knock enemies into control rods, traps or the reactor core. By pressing the primary button the player cursor can go into high power mode, providing higher repulsion of enemies and conversely higher risk to the player.

To ease the task the player also has a certain number of decoys at their disposal. Pressing the secondary button places a decoy to attract the enemies, luring them into two traps in the corners of the screen for bonus points, into destroying reactor rods or directly into the walls to kill them. Destroying a row of reactor rods gives the player one more decoy, as well as resetting the size of the slowly swelling reactor core.

A time limit is enforced by the slowly swelling reactor core, which limits the space to move about in the arena. Although the reactor doesn't actually melt down, the decreasing space provides for gradually increasing difficulty. After defeating the first wave of enemies, the solid reactor core changes into Vortex core, unlike the Protect core, is lethal to touch (thus making such levels significantly harder).


Game ID : GV-100

Main CPU : I8086 (@ 5 Mhz)
Sound CPU : MOS Technology M6502 (@ 894.886 Khz)
Sound Chips : DAC, Votrax SC-01

Screen orientation : Horizontal
Palette colors : 16

Players : 1
Control : trackball
Buttons : 2 (ENERGY, DECOY)


Reactor was released in July 1982. It was the first arcade game to credit the developer on the game's title screen.

First called 'Ram-It', then 'Expander', Reactor was Tim Skelly's first game design upon going independent. Skelly was one of the first independent game designers. He designed a number of games for Gottlieb (none of which were released) before taking an extended break in which he watched horror movies, drank margaritas and wrote a screenplay!

Approximately 1000 units were produced.


Designed and programmed by : Tim Skelly
Audio by : David D. Thiel


* Consoles :
Atari 2600 [US] (1982) [Model PB5330]


Edit this entry:

Licensed from Alexis Bousiges under a CC Attribution 3.0 License
cheat.dat entry:
00000000 023C 00000015 FFFFFFFF Infinite Lives PL1
00000000 0247 00000014 FFFFFFFF Infinite Decoys PL1
00000000 0405 00000015 FFFFFFFF Infinite Lives PL2
00000000 0410 00000014 FFFFFFFF Infinite Decoys PL2

Credit Pugsy's MAME Cheat file