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chimerab: MAME ROM Information.


Chimera Beast (c) 1993 Jaleco.

A horizontally scrolling shoot'em up where 1 or 2 players control creatures known as 'eaters' which are capable of eating other creatures and taking their DNA, thus acquiring their abilities or characteristics.

Chimera Beast takes place on a planet which is described as distant and Earth-like. The planet is overrun by animals known as eaters, capable of eating other creatures and acquiring their abilities or characteristics. The player controls one of these eaters and progresses through the game by means of evolution, consuming microscopic organisms in the first stage, fish in the second, and so on. When the player's creature gets big enough to take on humanity, the goal of the game is revealed. The planet's humans have developed space travel, which the player must thwart, so as not to give the eaters a means of escaping the planet. There are two possible endings: one in which the player is able to stop the eaters from escaping the planet, and one in which the eaters do escape and, we are told, will eventually make their way to Earth.

The chief innovation of Chimera Beast is its power-up system. Instead of collecting gun upgrades as in most games of this genre, the player's eater enhances itself by eating other creatures and assuming their abilities and defenses. Instead of simply having various types of projectile weaponry, the game attempts to make these new abilities as varied as possible. Consuming a crustacean might give the player's eater a hard protective shell, for example, while an insectoid creature might offer a poisonous tail instead. The game even includes the ability to use cancer as a weapon.

Another difference from typical shooter mechanics is that the player's eater does not die after being hit. It has a life bar, which can be charged by consuming enemies. It is even possible to eat enough charge the life bar past its starting position, creating a larger eater which is not only more powerful but can take more damage as well.


Jaleco Mega System 1-C hardware

Main CPU : 68000 (@ 12 Mhz)

Sound CPU : 68000 (@ 7 Mhz)

Sound Chips : YM2151 (@ 3.5 Mhz), (2x) OKI6295 (@ 30.303 Khz)

Players : 2

Control : 8-way joystick

Buttons : 2


Developed by C.P. Brain. Jaleco never officially released this game to the market. A rare advanced prototype version (fully complete) was available in March 1993.

The enemies in Chimera Beast are mostly animals, some with equivalent Earth versions and some without. Some of the enemy creatures include jellyfish, an eel-like agnathan, clown fish, clams, flying squirrels, and moles. Once the player reaches the human stage, they will face war vehicles such as tanks and jets.

In Stage 6, destroying the jeeps that are on the ground makes a pair of humans appear. They are Allen and Rick, from Jaleco's 1991 release, "64th Street - A Detective Story".


Chimera Beast features both a Good and Bad endings.


Executive produced by : Tokuhiro Takemori

Directed by : Shigeru Hashimoto

Game designed by : Y. Hiroyama

Programmed by : Manbow

Bg designers : Helluder, Toukaidou Nozomi, Reiko Takano, Tutomu Rukada

Obj. designers : Sigeru, Toukaidou Nozomi, Nanae

Creatures designed by : Y. Hiroyama

Sounds & Music composed by : Kiyoshi Yokoyama


Game's rom.

MAME Info:

0.36b7 [Luca Elia]

0.36b5 [?]


- [possible] At the end of the game and in a later level (the cave), there are a problem with the background color. Lord Caos (ID 00522)

- No movements in attract mode / instruction screen. YMI (ID 00366)


- 0.67: Changed description to 'Chimera Beast (prototype)'.

- 0.37b14: Changed 68000 CPU2 clock speed to 7MHz.

- 0.36b7: Luca Elia added Chimera Beast (Jaleco 1993).

- 8th October 1999: Luca Elia sent in a huge Mega System 1 update with many fixes and new drivers for Chimera Beast, Iga Ninjyutsuden, Plus Alpha and Peek-a-Boo.

- 0.36b5: Added Chimera Beast (Testdriver).


- Far away on a planet similar to Earth a new life form emerges a life from that ingests other creatures, absorbs their DNA, and then somehow is able to assume the characteristics of their prey. These greedym merciless creatures are without conscience. They are the most purley evil and dangerous of all known life forms in the universe. What fate awaits these amoral predators, which soon will come to be known simply as... Eaters!


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Diver Boy

Chimera Beast

Romset: 3328 kb / 11 files / 1.06 zip

MAME XML Output:

       <game name="chimerab" sourcefile="megasys1.c">
              <description>Chimera Beast (prototype)</description>
              <rom name="prg3.bin" size="262144" crc="70f1448f" sha1="60aaee1cf7aa15ffa4962d947747b0ae7cdcfd8a" region="maincpu" offset="0"/>
              <rom name="prg2.bin" size="262144" crc="821dbb85" sha1="df204db38995ff4c898b8a0121834ec1b84b215c" region="maincpu" offset="1"/>
              <rom name="prg8.bin" size="65536" crc="a682b1ca" sha1="66f5d5a73f5e8cba87eac09c55eee59117d94f7b" region="soundcpu" offset="0"/>
              <rom name="prg7.bin" size="65536" crc="83b9982d" sha1="68e7d344ebfffe19822c4cf9f7b13cb51f23537a" region="soundcpu" offset="1"/>
              <rom name="chimerab.mcu" size="4096" status="nodump" region="cpu2" offset="0"/>
              <rom name="s1.bin" size="524288" crc="e4c2ac77" sha1="db4bff3c02f22cc59a67b103fd176f4d88531f93" region="gfx1" offset="0"/>
              <rom name="s2.bin" size="524288" crc="fafb37a5" sha1="e36c4d18209add696982e36e84397ec51b9a9e7e" region="gfx2" offset="0"/>
              <rom name="scr3.bin" size="131072" crc="5fe38a83" sha1="0492be1a92baacb80ed5bdc0167beda3e9163d76" region="gfx3" offset="0"/>
              <rom name="b2.bin" size="524288" crc="6e7f1778" sha1="ac93f56c998f28e3f453fcdbf85f3217c9ae97de" region="gfx4" offset="0"/>
              <rom name="b1.bin" size="524288" crc="29c0385e" sha1="4416cb17d3121ec00bceff2614dc424a359f127a" region="gfx4" offset="80000"/>
              <rom name="voi11.bin" size="262144" crc="14b3afe6" sha1="6d8659d0fc6980ffc1661702fc787737448dce9d" region="oki1" offset="0"/>
              <rom name="voi10.bin" size="262144" crc="67498914" sha1="8d89fa90f38fd102b15f26f71491ea833ec32cb2" region="oki2" offset="0"/>
              <rom name="prom" size="512" status="nodump" region="proms" offset="0"/>
              <chip type="cpu" tag="maincpu" name="68000" clock="12000000"/>
              <chip type="cpu" tag="soundcpu" name="68000" clock="7000000"/>
              <chip type="audio" tag="lspeaker" name="Speaker"/>
              <chip type="audio" tag="rspeaker" name="Speaker"/>
              <chip type="audio" tag="ymsnd" name="YM2151" clock="3500000"/>
              <chip type="audio" tag="oki1" name="OKI6295" clock="4000000"/>
              <chip type="audio" tag="oki2" name="OKI6295" clock="4000000"/>
              <display tag="screen" type="raster" rotate="0" width="256" height="224" refresh="60.000000" />
              <sound channels="2"/>
              <input players="2" buttons="2" coins="2">
                     <control type="joy" ways="8"/>
              <dipswitch name="Flip Screen" tag="DSW1" mask="1">
                     <dipvalue name="Off" value="1" default="yes"/>
                     <dipvalue name="On" value="0"/>
              <dipswitch name="Demo Sounds" tag="DSW1" mask="2">
                     <dipvalue name="Off" value="2"/>
                     <dipvalue name="On" value="0" default="yes"/>
              <dipswitch name="Allow Continue" tag="DSW1" mask="4">
                     <dipvalue name="Off" value="0"/>
                     <dipvalue name="On" value="4" default="yes"/>
              <dipswitch name="Difficulty" tag="DSW1" mask="24">
                     <dipvalue name="Easy" value="16"/>
                     <dipvalue name="Normal" value="24" default="yes"/>
                     <dipvalue name="Hard" value="8"/>
                     <dipvalue name="Hardest" value="0"/>
              <dipswitch name="Lives" tag="DSW1" mask="96">
                     <dipvalue name="1" value="64"/>
                     <dipvalue name="2" value="96"/>
                     <dipvalue name="3" value="32" default="yes"/>
                     <dipvalue name="4" value="0"/>
              <dipswitch name="Service Mode" tag="DSW1" mask="128">
                     <dipvalue name="Off" value="128" default="yes"/>
                     <dipvalue name="On" value="0"/>
              <dipswitch name="Coin A" tag="DSW2" mask="15">
                     <dipvalue name="4 Coins/1 Credit" value="7"/>
                     <dipvalue name="3 Coins/1 Credit" value="8"/>
                     <dipvalue name="2 Coins/1 Credit" value="9"/>
                     <dipvalue name="1 Coin/1 Credit" value="15" default="yes"/>
                     <dipvalue name="2 Coins/3 Credits" value="6"/>
                     <dipvalue name="1 Coin/2 Credits" value="14"/>
                     <dipvalue name="1 Coin/3 Credits" value="13"/>
                     <dipvalue name="1 Coin/4 Credits" value="12"/>
                     <dipvalue name="1 Coin/5 Credits" value="11"/>
                     <dipvalue name="1 Coin/6 Credits" value="10"/>
                     <dipvalue name="Free Play" value="0"/>
              <dipswitch name="Coin B" tag="DSW2" mask="240">
                     <dipvalue name="4 Coins/1 Credit" value="112"/>
                     <dipvalue name="3 Coins/1 Credit" value="128"/>
                     <dipvalue name="2 Coins/1 Credit" value="144"/>
                     <dipvalue name="1 Coin/1 Credit" value="240" default="yes"/>
                     <dipvalue name="2 Coins/3 Credits" value="96"/>
                     <dipvalue name="1 Coin/2 Credits" value="224"/>
                     <dipvalue name="1 Coin/3 Credits" value="208"/>
                     <dipvalue name="1 Coin/4 Credits" value="192"/>
                     <dipvalue name="1 Coin/5 Credits" value="176"/>
                     <dipvalue name="1 Coin/6 Credits" value="160"/>
                     <dipvalue name="Free Play" value="0"/>
              <driver status="good" emulation="good" color="good" sound="good" graphic="good" savestate="unsupported" palettesize="1024"/>

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