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Alien Sector

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Title Screen

Alien Sector

Also known as: Baraduke (JP)
Developer: Namco
Publisher: Namco
Platform: Arcade (Namco Baraduke hardware)
Released in JP: July 1985[1]
Released in US: 1985
Released in EU: October 1985[2]

CopyrightIcon.png This game has hidden developer credits.
GraphicsIcon.png This game has unused graphics.
DebugIcon.png This game has debugging material.

It's Metroid before Metroid.

I'm your friend!

Easter Egg

Alien sector egg.png

Enter Service Mode, then press Right to change the sound effect to 01. Press the service button to display the screen calibration test grid, then press Left (x4), Right, Left (x2), Right (x5), Fire.

(Source: cmonkey)

Invincibility Dip Switch

Dip Switch B8 (Listed as "unused" in the game's manual and in MAME) originally enabled player invincibility. The game still loads this dip switch's value at DEB3...

DEB3: B6 42 5B         LDA   $425B	;Set A to Unknown Dip Switch value.
DEB6: 20 01            BRA   $DEB9	;Branch to player damage subroutine (Ignore value of dip switch)
DEB8: 39               RTS   		;End of subroutine.

...but the BRA opcode needs to be a BEQ for the dip switch to work. Put the following code in aliensec.xml to restore this dip switch's functionality:

  <cheat desc="Restore Invincibility Dip Switch">
    <script state="run">
    <script state="off">
(Source: Original TCRF research)

Developer Credits

If you enter your name as one of the following on the high-score list, you'll get a multicolored rainbow flashing effect for 8.5 seconds:

Name Developer Role
KISSY Yoshihiro Kishimoto Programmer
TAKKY Yukio Takahashi Designer
MAKO. Unknown Unknown
JUNKO Junko Ozawa Composer
YURI. Yuriko Keino Composer
FIGER Unknown Unknown
NKGT. Norio Nakagata Composer
WATAB Unknown Unknown
(Source: cmonkey)

Unused Graphics


Put the following codes in aliensec.xml to change the first background's graphics and palette:

  <cheat desc="Change Background 1 Graphic">
    <parameter min="32" max="224" step="16"/>
    <script state="run">
    <script state="off">
  <cheat desc="Change Background 1 Palette">
      <item value="0x70">Palette 1</item>
      <item value="0x74">Palette 2</item>
      <item value="0x78">Palette 3</item>
      <item value="0x7C">Palette 4</item>
      <item value="0x80">Palette 5</item>
      <item value="0x84">Palette 6</item>
      <item value="0x88">Palette 7</item>
      <item value="0x8C">Palette 8</item>
      <item value="0x90">Palette 9</item>
      <item value="0x94">Palette 10</item>
    <script state="run">
    <script state="run">
ID Graphic Notes
80 AlienSectorBG8.png An alternate version of the first floor background - AlienSectorBG1.png.
90 AlienSectorBG9.png Another version of the first floor background, this one separating the holes with vertical rails.
A0 AlienSectorBGA.png A slightly darker version of the second floor background - AlienSectorBG2.png
B0 AlienSectorBGB.png This unused background uses a copy of the foreground graphics from Stage 1, 4, and 7.
C0 AlienSectorBGC.png Rocky pillars separated by black space.
D0 AlienSectorBGD.png An alternate version of the fourth floor background - AlienSectorBG4.png - with fewer rivets and more vents.
E0 AlienSectorBGE.png A background of intersecting vines that doesn't resemble anything seen in the final game.


A few character graphics are unused, including a skull (to count the number of Paccets killed?), some kind of vertical meter, and a tower or something.

Used Alt
AlienSectorMapUsed.png AlienSectorMapAlt.png

There's an alternate version of the stage maps in the second background graphics ROM. The buildings are saucer-shaped instead of rectangular, and the boss graphic at the bottom more closely resembles what the game's bosses actually look like.

A few unused blocks for the tileset used in Stages 2, 5, and 7. The cracked graphics are close to the ones used in Stage 3 and 6, while the 16x16 blocks doesn't match the mechanical style of the rest of the tileset.

AlienSectorBigCrackedBlock.png AlienSectorBigSphere.png
Big cracked blocks and spheres that don't match up with any of the used tilesets.

Early Final
AlienSectorBonusItemsOld.png AlienSectorBonusItemsNew.png

Early graphics for the first three hidden bonus items.

(Source: Original TCRF research)