colour emulation good
palette 0
display type raster
orientation horizontal
resolution 294x238
frequency 60.096154Hz
sound emulation good
channels mono
players 1
nplayers 2P alt
controls joy
buttons 5
coin slots 3
cpu M6809 @ 1MHz
cpu M6808 @ 3.579545MHz
audio Speaker
audio DAC
version added .107u4
last change(s) none
name size crc set flags sha1
15me.1a  4096  9323eee5  zero2    727eaf669162a39c763203b925ab6b2cdb4626c1 
to16.3a  4096  a79213b2  zero2    ff9a59cb1d28af396a7b93df82a4bb825581bcce 
17m5.4a  4096  16a3c0dd  zero2    df11e4c7a62db85638d1fdda3602735b0d3f7f80 
21.4c  4096  7ca35cfd  zero2    9afa4f6641082f73bfc3e2b800acf82dcc2bafb3 
20m5.3b  4096  7473955b  zero2    b27515ca3fd2f938706415425226c4d7113eb276 
to19.1b  4096  f2bef850  zero2    78e50c790e3a8ebc4b65f2d827be8bd375bf4ef4 
18m5.4b  4096  7e4afe43  zero2    7a4f2128e48ed4d5e83885a3a72756822769fe5d 
to4.6b  2048  cb79ae42  zero2    d22bef68ef62aa012f1919338a33621138c2278b 
cabinet art
cabinet defender.png
marquee defender.png
control panel defender.png
flyer defender.png
PCB defender.png
additional information
info 0.24 [Marc Lafontaine]

Artwork available

  • The first time you run the game, it will say '01 0000 COINS LEFT'. To proceed, just hit F3.
  • Press F2 for Test-Mode
  • Press F1 + F2 for Bookkeeping/Setup
  • 0.143u4: Changed description of clones 'Tornado (bootleg set 1)' to 'Tornado (set 1, Defender bootleg)', 'ornado (bootleg set 2)' to 'Tornado (set 2, Defender bootleg)', 'Zero (set 1)' to 'Zero (set 1, Defender bootleg)', 'Zero (set 2)' to 'Zero (set 2, Defender bootleg)', 'Defense Command' to 'Defense Command (Defender bootleg)' and 'Defence Command' to 'Defence Command (Defender bootleg)'.
  • 0.133u1: Renamed (defendg) to (defenderg), (defendb) to (defenderb) and (defendw) to (defenderw).
  • 0.126u5: Andy Welburn added clone Defender (White label).
  • 0.126u4: Changed description of clone 'Defender (White label)' to 'Defender (Blue label)'. Renamed (defendw) to (defendb).
  • 0.122u8: Changed description of clones 'Zero' to 'Zero (set 1)' and 'Defense Command (set 1)' to 'Defense Command'.
  • 18th February 2007: Mr. Do - We have Defender artwork, thanks to the BYOAC group purchase. So as to no longer leave out our UK friends, there are now both US and UK options for Defender.
  • 0.107u4: David Haywood added clone Zero (set 2).
  • 31st July 2006: f205v dumped Zero (set 2).
  • 0.95u3: Changed visible area to 294x239. Fixed cpu1 rom address to $16000. Changed description of clones 'Defender ? (bootleg)' to 'Defender (bootleg)', 'Tornado? (bootleg set 1)' to 'Tornado (bootleg set 1)', 'Tornado? (bootleg set 2)' to 'Tornado (bootleg set 2)' and 'Zero ?' to 'Zero'.
  • 0.94u2: Pierpaolo Prazzoli added clone Star Trek (Defender bootleg).
  • 0.92: Highwayman added proms ($0, 200 - video inversion for cocktail table).
  • 0.86u3: Pierpaolo Prazzoli added Zero (bootleg of Defender).
  • 0.84u6: Aaron Giles removed hacky cheat controls from Defender/Stargate.
  • 0.84: David Haywood added clones Tornado? (bootleg set 1) and (bootleg set 2).
  • 0.74u2: Added clone Defender ? (bootleg).
  • 11th January 2003: Angelo Salese fixed the crash in Jeutel's Defender and cleaned up the decryption in it.
  • 0.57: Removed 3rd coin slot.
  • 24th August 2001: Highwayman submitted a clone of Defender called Defense.
  • 1st August 2001: Raver dumped Tornado (bootleg set 1), Jeutel France - although the PCB has german on it!.
  • 0.36RC1: Added clone Defender (White label).
  • 0.36b8: Changed description of clone 'Defense Command' to 'Defense Command (set 1)'.
  • 0.36b7: Added Testdriver: Defense Command (alternate) and Defender ? (Bootleg).
  • 0.35b2: Nicola Salmoria added clone Defender (Green label). Changed parent description to 'Defender (Red label)' and M6809 CPU1 clock speed to 1MHz.
  • 0.34b7: Nicola Salmoria added clone Defense Command (bootleg 1980).
  • 0.34b6: David Winter added clone Defense Command (1980?). Added clones 'Defender ? (Bootleg)' (Testdriver) and Defense Command (Testdriver).
  • 0.30: Maurizio Zanello added alternate controls in Defender and Stargate, to control the ship using the standard 8-way directional controls instead of up/down/reverse/thrust. Available only when the -cheat option is specified.
  • 0.25: Valerio Verrando fixed the Williams driver to support joystick in Blaster, Defender, Joust, Robotron, Splat and Stargate. Control: Up key = Up, Dn key = Down, Lft key = Reverse, ALT = Thrust, CTRL = Fire, X = Smart bomb, C = Hyperspace, 1+2 = Goes into game setup menu and 2+3 = Diagnostic menu (only in attract mode). Known issues: The joystick controls are strange, but Defender had lots of buttons.
  • 0.24: Added Defender (Williams 1980). The joystick controls are strange, but Defender had lots of buttons. Marc Lafontaine provided drivers for Robotron, Splat, Defender, Joust, Stargate, Bubbles, Blaster and Sinistar. Bubbles doesn't start, and Sinistar do weird things at startup. The other games work very well, though. For this version I provide a set of fonts that can be used to avoid jerkiness in williams games. If you use zipped roms remember to include them in the ZIP files. Game is playable with accurate colors and sound.
Other Emulators:
  • HiVE
  • JAE
  • Retrocade
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Romset: 29 kb / 14 files / 22.5 zip
history Zero (c) 1980 Amtec.

Amtec bootleg/hack of Midway's "Defender".


Another bootleg/hack of Defender called Zero was released by Jeutel.


Game's ROM.

Edit this entry at Arcade-History.com: http://www.arcade-history.com/?n=zero&page=detail&id=34717&o=2
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