Bomb Jack (Arcade)

Bomb Jack

Developer: Tehkan
Publisher: Tehkan
Platforms: Arcade (Custom)
Released internationally: October 1984

This game has unused code.
This game has unused graphics.
This game has revisional differences.

This game has a notes page

Bomb Jack do's and don'ts.

DO:

Collect and destroy bombs.
Avoid enemies with your jumping prowess.
Obtain bonus items and lit bombs for extra points.

DON'T:

Bomb Jack.

Sub-Page

Notes

Bonus Life Dip Switch

SW1, 2, and 3 of Dip Switch 2 are normally unused, and the service manual says as much. However, they were originally used for a Bonus Life setting. A routine starting at 5A07 handles the bonus life system, but the first opcode of that routine was changed from a "push af" to a "ret", effectively negating the process.

To re-enable this feature, change the value at 5A07 from E5 to C9, or put the following cheat in MAME's bombjack.xml cheat file:

  <cheat desc="Fix Extra Lives Dipswitch">
    <script state="run">
      <action>maincpu.mw@5A06=E5C9</action>
    </script>
  </cheat>

(Source: Mirko Buffoni (MAME Bomb Jack driver))

Unused Graphics

	This is a preliminary level tileset. Most of the tiles are just hexadecimal numbers.
	The sphere enemy was supposed to have a transformation animation. This is that.

Early	Final	Comments
		Stored near the end of the background tile bank are preliminary designs for the demi-titular bombs.
		The first and third unused designs also have lit graphics in the background tile bank.
		An early version of the bomb's explosion graphic. Only the first frame is different.
		The sphere enemy has an alternate, diagonally rotating animation.