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screwloo: MAME ROM Information.


Screw Loose (c) 1983 Mylstar Electronics.


Game ID : GV-123

Main CPU : I8086 (@ 5 Mhz)

Sound CPU : (2x) M6502 (@ 1 Mhz)

Sound Chips : (2x) DAC (@ 1 Mhz), (2x) AY8910 (@ 2 Mhz), SP0250 (@ 3.12 Mhz)

Screen orientation : Horizontal

Video resolution : 256 x 240 pixels

Screen refresh : 61.00 Hz

Palette colors : 16

Players : 1

Control : Sticks

Buttons : Start1, Start2


Screw Loose is an unreleased prototype and was Tim Skelly's last game for Mylstar. Only 3 units were produced.


Designed and programmed by : Tim Skelly

Sound by : Craig Beierwaltes


Game's rom.

Machine's picture.

MAME Info:

0.37b2 [Fabrice Frances]


- Screw Loose is a prototype game and was never released.


- 0.131u1: Pierpaolo Prazzoli fixed screwy graphics area on one screen in Screw Loose.

- 0.126u4: Fixed audio rom address to $c000. Added dipswitches 'Sound Test' and 2x 'Unknown'.

- 0.126u3: Replaced the 2x AY-3-8910A sound with AY-3-8913A.

- 0.102u5: Added SP0250 (3120000 Hz) speech.

- 0.37b3: Added 2nd M6502 (1MHz) CPU3, 2nd DAC and 2x AY-8910 (2MHz). Changed M6502 CPU2 clock speed to 1MHz. Added the missing cpu2/3 roms.

- 0.37b2: Fabrice Frances added Screw Loose (prototype) (Mylstar 1983).

Recommended Games (Maze 2):



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Robot Bowl




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Mutant Night

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Atomic Robo-kid

Bakutotsu Kijuutei


Povar / Sobrat' Buran / Agroprom (Pssst)


Robocop 2

Robocop 3 (Nintendo Super System)

Act-Fancer Cybernetick Hyper Weapon

Escape from the Planet of the Robot Monsters

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Cyberbots: Fullmetal Madness

Romset: 96 kb / 13 files / 49.4 zip

MAME XML Output:

       <game name="screwloo" sourcefile="gottlieb.c">
              <description>Screw Loose (prototype)</description>
              <rom name="rom4" size="8192" crc="744a2513" sha1="d6e8e016d9af984fae9b6667bedeea069637bd3a" region="maincpu" offset="6000"/>
              <rom name="rom3" size="8192" crc="ffde5b5d" sha1="50ac0e600935b8b1f8b68c40ad21a179b176e535" region="maincpu" offset="8000"/>
              <rom name="rom2" size="8192" crc="97932b05" sha1="6807c6e08edeb93aa7b4969eb78de3cf88a00b72" region="maincpu" offset="a000"/>
              <rom name="rom1" size="8192" crc="571b65ca" sha1="75077f4fab296b3802271fa77af588003570cde6" region="maincpu" offset="c000"/>
              <rom name="rom0" size="8192" crc="6447fe54" sha1="6391c841cafd35dd315d9fac99ed5d8304018747" region="maincpu" offset="e000"/>
              <rom name="drom1" size="8192" crc="ae965ade" sha1="84a690cba8990fe6406b7cfbd6ea643a48446567" region="r2sound:audiocpu" offset="c000"/>
              <rom name="yrom1" size="8192" crc="3719b0b5" sha1="4f215ca2f15956374c4cd9484b6798f1c4d60fc7" region="r2sound:speechcpu" offset="e000"/>
              <rom name="bg0" size="4096" crc="1fd5b649" sha1="4e2127a4458d54f094934c6f5f154a6db5d0c8b0" region="bgtiles" offset="0"/>
              <rom name="bg1" size="4096" crc="c8ddb8ba" sha1="58137a5043157d08af4d628cf5384d7f530393f7" region="bgtiles" offset="1000"/>
              <rom name="fg3" size="8192" crc="97d4e63b" sha1="e06ecb73148f16b33132767f8f0dffc37eeba5f1" region="sprites" offset="0"/>
              <rom name="fg2" size="8192" crc="f76e56ca" sha1="32252d424f31aa899d6c614f1d1006c2ef49df84" region="sprites" offset="2000"/>
              <rom name="fg1" size="8192" crc="698c395f" sha1="46c6700b2943c35c9ac45791652eafbb4a4e059a" region="sprites" offset="4000"/>
              <rom name="fg0" size="8192" crc="f23269fb" sha1="9a418a372da18cf33bcfba07202cf2ac7a1dcd1d" region="sprites" offset="6000"/>
              <chip type="cpu" tag="maincpu" name="8088" clock="5000000"/>
              <chip type="cpu" tag="r2sound:audiocpu" name="M6502" clock="1000000"/>
              <chip type="cpu" tag="r2sound:speechcpu" name="M6502" clock="1000000"/>
              <chip type="audio" tag="mono" name="Speaker"/>
              <chip type="audio" tag="r2sound" name="Gottlieb Sound rev. 2"/>
              <chip type="audio" tag="r2sound:dac" name="DAC"/>
              <chip type="audio" tag="r2sound:ay1" name="AY-3-8913A" clock="2000000"/>
              <chip type="audio" tag="r2sound:ay2" name="AY-3-8913A" clock="2000000"/>
              <chip type="audio" tag="r2sound:spsnd" name="SP0250" clock="3120000"/>
              <display tag="screen" type="raster" rotate="0" width="256" height="240" refresh="61.419025" pixclock="5000000" htotal="318" hbend="0" hbstart="256" vtotal="256" vbend="0" vbstart="240" />
              <sound channels="1"/>
              <input players="1" buttons="2" coins="2" service="yes">
                     <control type="doublejoy" ways="8" ways2="8"/>
              <dipswitch name="Demo Sounds" tag="DSW" mask="1">
                     <dipvalue name="Off" value="1"/>
                     <dipvalue name="On" value="0" default="yes"/>
              <dipswitch name="Demo mode" tag="DSW" mask="2">
                     <dipvalue name="Off" value="0" default="yes"/>
                     <dipvalue name="On" value="2"/>
              <dipswitch name="1st Bonus Atom at" tag="DSW" mask="4">
                     <dipvalue name="5000" value="0" default="yes"/>
                     <dipvalue name="20000" value="4"/>
              <dipswitch name="Free Play" tag="DSW" mask="8">
                     <dipvalue name="Off" value="0" default="yes"/>
                     <dipvalue name="On" value="8"/>
              <dipswitch name="Coinage" tag="DSW" mask="80">
                     <dipvalue name="2 Coins/1 Credit" value="0"/>
                     <dipvalue name="2 Coins/2 Credits" value="16"/>
                     <dipvalue name="1 Coin/1 Credit" value="64" default="yes"/>
                     <dipvalue name="1 Coin/2 Credits" value="80"/>
              <dipswitch name="1st Bonus Hand at" tag="DSW" mask="32">
                     <dipvalue name="25000" value="0" default="yes"/>
                     <dipvalue name="50000" value="32"/>
              <dipswitch name="Hands" tag="DSW" mask="128">
                     <dipvalue name="3" value="0" default="yes"/>
                     <dipvalue name="5" value="128"/>
              <dipswitch name="Service Mode" tag="IN1" mask="1">
                     <dipvalue name="Off" value="1" default="yes"/>
                     <dipvalue name="On" value="0"/>
              <dipswitch name="Unknown" tag="r2sound:SB2" mask="1">
                     <dipvalue name="Off" value="1" default="yes"/>
                     <dipvalue name="On" value="0"/>
              <dipswitch name="Unknown" tag="r2sound:SB2" mask="2">
                     <dipvalue name="Off" value="2" default="yes"/>
                     <dipvalue name="On" value="0"/>
              <dipswitch name="Unknown" tag="r2sound:SB2" mask="4">
                     <dipvalue name="Off" value="4" default="yes"/>
                     <dipvalue name="On" value="0"/>
              <dipswitch name="Unknown" tag="r2sound:SB2" mask="8">
                     <dipvalue name="Off" value="8" default="yes"/>
                     <dipvalue name="On" value="0"/>
              <dipswitch name="Unknown" tag="r2sound:SB2" mask="16">
                     <dipvalue name="Off" value="16" default="yes"/>
                     <dipvalue name="On" value="0"/>
              <dipswitch name="Unknown" tag="r2sound:SB2" mask="32">
                     <dipvalue name="Off" value="32" default="yes"/>
                     <dipvalue name="On" value="0"/>
              <dipswitch name="Sound Test" tag="r2sound:SB2" mask="64">
                     <dipvalue name="Off" value="64" default="yes"/>
                     <dipvalue name="On" value="0"/>
              <driver status="good" emulation="good" color="good" sound="good" graphic="good" savestate="unsupported" palettesize="16"/>

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