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gekitsui: MAME ROM Information.


Gekitsui Oh (c) 1985 Data East.


Main CPU : (2x) M6809 (@ 2 Mhz)

Sound CPU : M6502 (@ 1.5 Mhz)

Sound Chips : (2x) AY8910 (@ 1.5 Mhz)

Players : 2

Control : 8-way joystick

Buttons : 5


Released in September 1985.

This game is known outside Japan as "Zero Target".


Game's rom.

MAME Info:

0.141u1 [ranger_lennier, B. Sparks, Kevin Eshbach, Smitdogg, The Dumping Union]

0.80u2 [Bryan McPhail, Pierpaolo Prazzoli, David Haywood]


- Video of the original board running for reference. This is a version I dumped on 1/21/2011, should be in MAME .141u1 or u2. Smitdogg (ID 04193)


- 0.141u1: Ranger_lennier, B. Sparks, Kevin Eshbach, Smitdogg and The Dumping Union added Zero Target (World, CW). Changed 'Zero Target (World)' to clone 'Zero Target (World, CT)'. Renamed (zerotrgt) to (zerotrgta).

- 20th January 2011: Smitdogg - We got Zero Target for testing. It's also a previously undumped version.

- 0.135u2: Fabio Priuli added save state support to Counter Steer driver.

- 0.131u1: Angelo Salese modified my coin_insertion() function to use ASSERT & CLEAR instead of PULSE_LINE in Zero Target.

- 0.130: Olivier Galibert and Angelo Salese added preliminary proper ROZ effects hooked up for Zero Target. Angelo Salese fixed sprite positioning bug, fixed a sprite bug when flip y flag is used and cleaned-up the whole routine in Zero Target.

- 0.129u6: Various improvements to the Zero Target / Counter Steer HW and cleaned-up the driver. Fixed foreground & background colors and hand-tuned sound in Zero Target based on a side-by-side test. Fixed sprite colors [Angelo Salese]. Corrected dipswitch settings for Zero Target [Yasuhiro Ogawa, Angelo Salese]. Changed visible area to 256x240. Added dipswitches 'Coin A/B', 'Cabinet', 'Difficulty', 'Lives' and 'Bonus Life'.

- 3rd March 2009: Angelo Salese - I'm been looking at the Zero Target / Gekitsui Oh driver. I've fixed the sound and started to look the gfxs in there. I'm not 100% sure about the colors in there, for sure the hud uses a vram attribute for the 'junctions' and that'll explain why colors are wrong especially for these parts. The rest looks correct but awkward, anybody has a screen of the original game? Update: Thanks to various guys that reported to me about the NV video, edited the page with the proper correct colors.

- 0.106u13: MASH added plds ($0, 200 - pal10h8.12f and pal12l6.17f) to Zero Target and clone.

- 0.80u2: Bryan McPhail added Zero Target (World) (Data East 1985) and clone Gekitsui Oh (Japan). Various things not yet understood.

- 28th December 1999: J-ROM dumped Gekitsui Oh (Japan).

Recommended Games (Airforce 3D):

Sky Raider

Red Baron

M.A.C.H. 3

Fire Fox

Future Spy

Us vs. Them

Zero Target


Top Gunner

After Burner II

After Burner (Mega-Tech)

Vs. Top Gun

Captain Sky Hawk (PlayChoice-10)

Air Inferno

G-LOC Air Battle

F-15 Strike Eagle

Strike Fighter

Air Combat

Air Combat 22

Wild Pilot

Wing War

Sky Target

Sega Strike Fighter

Romset: 297 kb / 18 files / 114.0 zip

MAME XML Output:

       <game name="gekitsui" sourcefile="cntsteer.c" cloneof="zerotrgt" romof="zerotrgt">
              <description>Gekitsui Oh (Japan)</description>
              <manufacturer>Data East Corporation</manufacturer>
              <rom name="ct01" size="32768" crc="d3d82d8d" sha1="c175c626d4cb89a2d82740c04892092db6faf616" region="maincpu" offset="8000"/>
              <rom name="ct08.16a" size="16384" crc="7e8db408" sha1="2ae407d15645753a2a0d691c9f1cf1eb383d3e8a" region="subcpu" offset="4000"/>
              <rom name="cty07.14a" size="16384" crc="119b6211" sha1="2042f06387d34fad6b63bcb8ac6f9b06377f634d" region="subcpu" offset="8000"/>
              <rom name="ct06.13a" size="16384" crc="bce5adad" sha1="86c4eef0d68679a24bab6460b49640a498f32ecd" region="subcpu" offset="c000"/>
              <rom name="ct00.1c" merge="cw00.c1" size="8192" crc="ae091b6c" sha1="8b3a1c0acbfa56f05bcf65677f85d70c8c9640d6" region="audiocpu" offset="e000"/>
              <rom name="ct05" size="16384" crc="b9e997a1" sha1="5891cb0984bf4a1ccd80ef338c47e3d5705a1331" region="gfx1" offset="0"/>
              <rom name="ct02.14c" merge="cw02.c14" size="32768" crc="d2a0bb72" sha1="ee060f8db0b1fa1ba1034bf94cf44ff6820660bd" region="gfx2" offset="0"/>
              <rom name="ct03.15c" merge="cw03.c15" size="32768" crc="79f2be20" sha1="62cf55d9163d522b7cb0e760f0d5662c529a22e9" region="gfx2" offset="8000"/>
              <rom name="ct04.17c" merge="cw04.c17" size="32768" crc="1037cce8" sha1="11e49e29f9b60fbf36a301a566f233eb6150d519" region="gfx2" offset="10000"/>
              <rom name="ct09.4j" merge="cw09.j4" size="16384" crc="8c859d41" sha1="8095e83de81d2c9f270a303322ddf84568e3d37a" region="gfx3" offset="0"/>
              <rom name="ct11.7j" merge="cw11.j7" size="16384" crc="5da2d9d8" sha1="d2cfdbf892bce3667545568998aa03bfd03155c5" region="gfx3" offset="10000"/>
              <rom name="ct13.10j" merge="cw13.j10" size="16384" crc="b004cedd" sha1="2a503ea14c66805b37f25096ecfec19a07cdc387" region="gfx3" offset="20000"/>
              <rom name="ct15.13j" merge="cw15.j13" size="16384" crc="4473fe66" sha1="0accbcb801f58df410af305a87a960e526f8a25a" region="gfx3" offset="30000"/>
              <rom name="ct10.6j" merge="cw10.j6" size="8192" crc="16073975" sha1="124128db649116d675503b03310ebbd919d5a837" region="gfx4" offset="0"/>
              <rom name="ct12.9j" merge="cw12.j9" size="8192" crc="9776974e" sha1="7e944379c3ff3211c84bd4b48cebbd52c586ff88" region="gfx4" offset="10000"/>
              <rom name="ct14.12j" merge="cw14.j12" size="8192" crc="5f77e84d" sha1="ef7a53ad40ef5d3b7ceecb174099b8f2adfda92e" region="gfx4" offset="20000"/>
              <rom name="ct16.15j" merge="cw16.j15" size="8192" crc="ebed04d3" sha1="df5484ab44ddf91fddbb895606875b6733b03a51" region="gfx4" offset="30000"/>
              <rom name="mb7118h.7k" merge="mb7118h.k7" size="256" crc="4a7c187a" sha1="2463ed582b77252a798b946cc831c4edd6e6b31f" region="proms" offset="0"/>
              <rom name="mb7052.6k" merge="6301-in.k6" size="256" crc="cc9c7d43" sha1="707fcc9579bae4233903142efa7dfee7d463ae9a" region="proms" offset="100"/>
              <rom name="pal10h8.12f" size="44" crc="173f9798" sha1="8b0b0314d25a70e098df5d93191669738d3e57af" region="plds" offset="0"/>
              <rom name="pal10h8.14e" size="44" status="nodump" region="plds" offset="100"/>
              <rom name="pal12l6.17f" size="52" crc="29b7e869" sha1="85bdb6872d148c393c4cd98872b4920444394620" region="plds" offset="200"/>
              <chip type="cpu" tag="maincpu" name="M6809" clock="2000000"/>
              <chip type="cpu" tag="subcpu" name="M6809" clock="2000000"/>
              <chip type="cpu" tag="audiocpu" name="M6502" clock="1500000"/>
              <chip type="audio" tag="mono" name="Speaker"/>
              <chip type="audio" tag="ay1" name="AY-3-8910A" clock="1500000"/>
              <chip type="audio" tag="ay2" name="AY-3-8910A" clock="1500000"/>
              <display tag="screen" type="raster" rotate="0" width="256" height="240" refresh="60.000000" />
              <sound channels="1"/>
              <input players="2" buttons="1" coins="2">
                     <control type="joy" ways="8"/>
              <dipswitch name="Coin A" tag="DSW0" mask="3">
                     <dipvalue name="2 Coins/1 Credit" value="0"/>
                     <dipvalue name="1 Coin/1 Credit" value="3" default="yes"/>
                     <dipvalue name="1 Coin/2 Credits" value="2"/>
                     <dipvalue name="1 Coin/3 Credits" value="1"/>
              <dipswitch name="Coin B" tag="DSW0" mask="12">
                     <dipvalue name="2 Coins/1 Credit" value="0"/>
                     <dipvalue name="1 Coin/1 Credit" value="12" default="yes"/>
                     <dipvalue name="1 Coin/2 Credits" value="8"/>
                     <dipvalue name="1 Coin/3 Credits" value="4"/>
              <dipswitch name="Cabinet" tag="DSW0" mask="16">
                     <dipvalue name="Upright" value="0"/>
                     <dipvalue name="Cocktail" value="16" default="yes"/>
              <dipswitch name="Difficulty" tag="DSW0" mask="32">
                     <dipvalue name="Normal" value="32" default="yes"/>
                     <dipvalue name="Hard" value="0"/>
              <dipswitch name="Lives" tag="DSW0" mask="64">
                     <dipvalue name="3" value="64" default="yes"/>
                     <dipvalue name="5" value="0"/>
              <dipswitch name="Bonus Life" tag="DSW0" mask="128">
                     <dipvalue name="30K only" value="128" default="yes"/>
                     <dipvalue name="30K and 100K" value="0"/>
              <driver status="preliminary" emulation="preliminary" color="good" sound="imperfect" graphic="imperfect" cocktail="preliminary" savestate="supported" palettesize="256"/>

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