Home News Forum                            

Play your favorite classic games and more with the GameEx front end. Read more.

strkforc: MAME ROM Information.


Strikeforce (c) 1991 Midway.

Saurian lizard men have overrun all twenty-two planets that form the New Earth Solar System colonies, capturing and mutating the resident human colonies into reptiles to use as slave labour at their stronghold base, the Saurian Mega-Star Apocalypse

In the 3rd game in Midway's seminal "Defender" series, Strikeforce again has the player flying a spaceship over the surface of a series of two-way, horizontally scrolling planets, destroying enemy waves and rescuing humans from the alien invaders; with rescued humans hanging from the underside of the player's ship. Once these tasks have been completed, the mothership arrives to pick up the player's ship, together with any humans they have rescued. Players can decide which planets to attack, when to purchase additional firepower and when to attack the Apocalypse.

Strikeforce's graphics differ from the minimalist, stylish appearance of the first two games in the series; with full colour sprites, multi-layer scrolling and colourful, visceral explosions giving the game its own distinctive look and feel.


Midway Y Unit hardware

Main CPU : TMS34010 (@ 6.25 Mhz)

Sound CPU : M6809 (@ 2 Mhz)

Sound Chips : YM2151 (@ 3.57958 Mhz), DAC (@ 3.57958 Mhz), HC55516 (@ 3.57958 Mhz)

Screen orientation : Horizontal

Video resolution : 400 x 255 pixels

Screen refresh : 53.20 Hz

Palette colors : 256

Players : 2

Control : 8-way joystick

Buttons : 3


Released in February 1991.

If you look at the Today's Victors part of the high score screen, you should see the initials DEF for rank 5, END in rank 6, and ER in rank 7; they spell out the word, 'DEFENDER' (as in the game, "Defender").


* To reach the ultimate bad guy without having to go through the entire enemy starship, you just play the LEFT player, and get yourself killed at the far LEFT end of the starship (the very beginning). When you reincarnate, you'll be at the far RIGHT end of the board, past the wall (or IN the wall if you weren't far enough left). The boss will not appear until you move to the left past where he should be (though things will start firing at you immediately). Kill the boss, get your free credit, start again. ;)

* Strategy Tip : kill dreadnaughts with one timewarp and one cluster bomb. You always get the time warp back, plus other goodies.

* Score Hogging Tip : clear out all the planets but one, and then fly around from starbase to starbase waiting for dreadnaughts to appear. Pick 'em off using the above method. This gets boring after a while, of course...


1. Defender (1980)

2. Stargate (1981)

3. Strikeforce (1991)

4. Defender 2000 (1996, Atari Jaguar)


Programmers : Todd Allen (TRA), Eric Pribyl (ELP)

Artists : John Vogel (JCV), Jim Gentile (JPG)

Music and Sounds : Chris Granner (C G), Rich Karstens (R K)

Staff : Sheridan Oursler (S O), Mark Penacho (MDP), Tim Coman (TIM), John Tobias (JON), Jack E. Haeger (JEH), Eugene Jarvis (EPJ), Ray Czajka (RAY), George N. Petro (GNP), (BUN), (LOF), Al Lasko (A L), Cary Mednick (CMM), Steve Ritchie (SSR), Larry DeMar (LED), Mark Turmell (M T), (MTN), (NLN), (JTK)


Game's rom.

Machine's picture.

MAME Info:

0.34b7 [Alex Pasadyn, Zsolt Vasvari, Kurt Mahan]


- In the test menu the RGB screens flicker on the upper side. RansAckeR (ID 00275)


- 0.145u7: Added 'Williams CVSD Sound Board' sound.

- 0.122u6: Changed TMS34010 CPU1 clock speed to 48MHz and M6809E CPU2 to 8MHz.

- 0.122u4: Replaced M6809 CPU with M6809E. Changed YM2151 clock speed to 3579545 Hz.

- 0.114u1: Changed TMS34010 CPU clock speed to 6MHz, visible area to 399x253 and VSync to 27.407585 Hz.

- 0.37b5: Changed visible area to 400x255 and palettesize from 65536 to 256 colors.

- 0.36b16: Added Custom sound and changed VSync to 53.204948 Hz.

- 0.36b4: Changed VSync to 57 Hz.

- 0.35b2: Replaced the 3x DAC sound with HC55516 and 1x DAC.

- 0.34b8: Changed description to 'Strike Force (rev 1 02/25/91)'.

- 0.34b7: Alex Pasadyn, Zsolt Vasvari and Kurt Mahan added Strike Force (Midway 1991).


- The Saurian invasion must be stopped! Only you, Strikeforce, can stop them.

- Your Mission: Destroy apocalypse the Saurian magastar.

- First you must eliminate the invaders.

- Deploy your troops to rescue colonists and capture weapons. Stockpile weapons to blast the apocalypse.

- Study the enemy, then attack fast, hard and without mercy. The universe depends on you STRIKE FORCE.


Recommended Games (Defender):





Cosmic Avenger


The Percussor


4 Fun in 1 (Scramble)

Space Odyssey



A. D. 2083





Darius II

Darius Gaiden - Silver Hawk

Fantasy Zone

Fantasy Zone (Mega-Tech)

Fantasy Zone 2

Alpha One

Back Fire

Thunder Cross

Thunder Cross II


Mega Blast

Air Buster

Arrow Flash (Mega-Tech)

Bio-ship Paladin


ThunderForce AC

Thunder Force II MD (Mega-Tech)

Cosmic Cop

E.D.F. : Earth Defense Force

Metal Black

Strike Force


Andro Dunos

Last Resort


Blazing Star

Romset: 1984 kb / 17 files / 980.4 zip

MAME XML Output:

       <game name="strkforc" sourcefile="midyunit.c">
              <description>Strike Force (rev 1 02/25/91)</description>
              <rom name="sfu4.bin" size="65536" crc="8f747312" sha1="729929c209741e72eb83b407cf95d7709ec1b5ae" region="cvsd:cpu" offset="10000"/>
              <rom name="sfu19.bin" size="65536" crc="afb29926" sha1="ad904c0968a90b8187cc87d6c171fbc021d2f66f" region="cvsd:cpu" offset="30000"/>
              <rom name="sfu20.bin" size="65536" crc="1bc9b746" sha1="a5ad40ce7f228f30c21c5a7bdc2893c2a7fe7f58" region="cvsd:cpu" offset="50000"/>
              <rom name="sfu105.bin" size="131072" crc="7895e0e3" sha1="fa471af9e673a82713a590f463f87a4c59e3d5d8" region="user1" offset="c0000"/>
              <rom name="sfu89.bin" size="131072" crc="26114d9e" sha1="79906966859f0ae0884b956e7d520e3cff78fab7" region="user1" offset="c0001"/>
              <rom name="sfu111.bin" size="131072" crc="878efc80" sha1="94448002faff5839beab5466e5a41195869face3" region="gfx1" offset="0"/>
              <rom name="sfu112.bin" size="131072" crc="93394399" sha1="67ad5c27c3c82fa6055032df98c365c56c7f8b1b" region="gfx1" offset="20000"/>
              <rom name="sfu113.bin" size="131072" crc="9565a79b" sha1="ebb90132ed8acbbed09bbcdff435cdf60a3ef8ab" region="gfx1" offset="40000"/>
              <rom name="sfu114.bin" size="131072" crc="b71152da" sha1="784e229a5ae51776a3e984f22d1d73b2286cfc68" region="gfx1" offset="60000"/>
              <rom name="sfu106.bin" size="131072" crc="a394d4cf" sha1="d08c5994b08dafd233a270d24b4c851bcedf5cbe" region="gfx1" offset="80000"/>
              <rom name="sfu107.bin" size="131072" crc="edef1419" sha1="cda8de55355eabf8146a243f917f6d27babe5ce3" region="gfx1" offset="a0000"/>
              <rom name="sfu95.bin" size="131072" crc="519cb2b4" sha1="9059d2ca2705bd297c066a9470b756aecb395431" region="gfx1" offset="200000"/>
              <rom name="sfu96.bin" size="131072" crc="61214796" sha1="bad32ef909f714289ee7cf2a5179a3b96678a72a" region="gfx1" offset="220000"/>
              <rom name="sfu97.bin" size="131072" crc="eb5dee5f" sha1="9432140b4c983472fdc41f36390ee4db67896475" region="gfx1" offset="240000"/>
              <rom name="sfu98.bin" size="131072" crc="c5c079e7" sha1="3cbd56db7d0eeaa6fb4f1cc8793cd1deff4e3c2c" region="gfx1" offset="260000"/>
              <rom name="sfu90.bin" size="131072" crc="607bcdc0" sha1="f174a549ade75df2f86142150a1e4c3554907602" region="gfx1" offset="280000"/>
              <rom name="sfu91.bin" size="131072" crc="da02547e" sha1="d29c071bd9deab2414ac0733d9a18fcf8c68b4d9" region="gfx1" offset="2a0000"/>
              <chip type="cpu" tag="maincpu" name="TMS34010" clock="48000000"/>
              <chip type="cpu" tag="cvsd:cpu" name="M6809E" clock="8000000"/>
              <chip type="audio" tag="mono" name="Speaker"/>
              <chip type="audio" tag="cvsd" name="Williams CVSD Sound Board"/>
              <chip type="audio" tag="cvsd:ym2151" name="YM2151" clock="3579545"/>
              <chip type="audio" tag="cvsd:dac" name="DAC"/>
              <chip type="audio" tag="cvsd:cvsd" name="HC-55516"/>
              <display tag="screen" type="raster" rotate="0" width="399" height="253" refresh="54.815170" pixclock="8000000" htotal="505" hbend="0" hbstart="399" vtotal="289" vbend="0" vbstart="253" />
              <sound channels="1"/>
              <input players="2" buttons="3" coins="4" tilt="yes">
                     <control type="joy" ways="8"/>
              <dipswitch name="Service Mode" tag="IN1" mask="16">
                     <dipvalue name="Off" value="16" default="yes"/>
                     <dipvalue name="On" value="0"/>
              <dipswitch name="Coin Meter" tag="DSW" mask="1">
                     <dipvalue name="Shared" value="1" default="yes"/>
                     <dipvalue name="Independent" value="0"/>
              <dipswitch name="Credits to Start" tag="DSW" mask="2">
                     <dipvalue name="1" value="2" default="yes"/>
                     <dipvalue name="2" value="0"/>
              <dipswitch name="Points for Ship" tag="DSW" mask="12">
                     <dipvalue name="40000" value="8"/>
                     <dipvalue name="50000" value="12" default="yes"/>
                     <dipvalue name="75000" value="4"/>
                     <dipvalue name="100000" value="0"/>
              <dipswitch name="Lives" tag="DSW" mask="16">
                     <dipvalue name="3" value="16" default="yes"/>
                     <dipvalue name="4" value="0"/>
              <dipswitch name="Difficulty" tag="DSW" mask="224">
                     <dipvalue name="Level 1" value="128"/>
                     <dipvalue name="Level 2" value="192"/>
                     <dipvalue name="Level 3" value="160"/>
                     <dipvalue name="Level 4" value="224" default="yes"/>
                     <dipvalue name="Level 5" value="96"/>
                     <dipvalue name="Level 6" value="64"/>
                     <dipvalue name="Level 7" value="32"/>
                     <dipvalue name="Level 8" value="0"/>
              <dipswitch name="Coin B" tag="DSW" mask="1792">
                     <dipvalue name="1 Coin/1 Credit" value="1792" default="yes"/>
                     <dipvalue name="1 Coin/2 Credits" value="1536"/>
                     <dipvalue name="1 Coin/3 Credits" value="1280"/>
                     <dipvalue name="1 Coin/4 Credits" value="1024"/>
                     <dipvalue name="1 Coin/5 Credits" value="768"/>
                     <dipvalue name="1 Coin/6 Credits" value="512"/>
                     <dipvalue name="U.K. Elect." value="256"/>
                     <dipvalue name="Free Play" value="0"/>
              <dipswitch name="Coin A" tag="DSW" mask="30720">
                     <dipvalue name="5 Coins/1 Credit" value="12288"/>
                     <dipvalue name="4 Coins/1 Credit" value="14336"/>
                     <dipvalue name="3 Coins/1 Credit" value="16384"/>
                     <dipvalue name="2 Coins/1 Credit" value="18432"/>
                     <dipvalue name="1 Coin/1 Credit" value="30720" default="yes"/>
                     <dipvalue name="1 Coin/2 Credits" value="28672"/>
                     <dipvalue name="1 Coin/3 Credits" value="26624"/>
                     <dipvalue name="1 Coin/4 Credits" value="24576"/>
                     <dipvalue name="1 Coin/5 Credits" value="22528"/>
                     <dipvalue name="1 Coin/6 Credits" value="20480"/>
                     <dipvalue name="1 Coin/1 Credit - 2 Coins/3 Credits" value="10240"/>
                     <dipvalue name="1 Coin/1 Credit - 3 Coins/4 Credits" value="8192"/>
                     <dipvalue name="1 Coin/1 Credit - 4 Coins/5 Credits" value="6144"/>
                     <dipvalue name="1 Coin/1 Credit - 5 Coins/6 Credits" value="4096"/>
                     <dipvalue name="3 Coin/1 Credit - 5 Coins/2 Credits" value="2048"/>
                     <dipvalue name="1 Coin/2 Credits - 2 Coins/5 Credits" value="0"/>
              <dipswitch name="Test Switch" tag="DSW" mask="32768">
                     <dipvalue name="Off" value="32768" default="yes"/>
                     <dipvalue name="On" value="0"/>
              <driver status="good" emulation="good" color="good" sound="good" graphic="good" savestate="supported" palettesize="256"/>

emumovies.com      Retro bytes Portal           Bookmark and Share

Developed by: Spesoft  Headsoft     Terms of use     Privacy    Advertise