Dragon's Lair / Space Ace Engineering Mode

DRAGON'S LAIR / SPACE ACE ENGINEERING MODE - March 20, 2000
Written by Jeff Kulczycki

Engineering mode was designed to let the engineers play-test a scene without having to play through the whole game. This document will show you how to get into engineering mode and how to use it.

When the engineering mode is enabled, one of the DIP switch banks on the game's main PCB will act as the scene select according to the tables below, and the specified scene will play over and over continuously.

NOTE: All DIP switches discussed in this document must be switched while the game's power is turned off!

Dragon's Lair's engineering mode is activated by turning DIP switch A3 OFF. You can then use DIP switch bank B to select the scene to play. Again, you must set these switches before you power up the game. The game will start normally with the attract mode. Insert coins and press start. The game will then jump immediately to the selected scene. The only way to exit engineering mode is to shut the machine off and reset your DIP switches.

With the Dragon's Lair revision F and F2 EPROMs, you will have a slight problem using engineering mode. These ROM revisions have remapped DIP switch B3 to select which laserdisc player is being used. If you have this ROM version, you'll have to leave B3 set to wherever it's at.

B7	B6	B5	B4	B3	B2	B1	B0	Scene Name
ON	ON	ON	ON	ON	ON	ON	OFF	Tentacles & Halberd
ON	ON	ON	ON	ON	ON	OFF	ON	Mist Room (snakes)
ON	ON	ON	ON	ON	ON	OFF	OFF	Ropes
ON	ON	ON	ON	ON	OFF	ON	ON	Yellow Brick Road (pool of water / spider)
ON	ON	ON	ON	ON	OFF	ON	OFF	Wizard's Chamber (cauldron / slime monster)
ON	ON	ON	ON	ON	OFF	OFF	ON	Spiral Staircase (Giddy Goons)
ON	ON	ON	ON	ON	OFF	OFF	OFF	YMCA Room (flattening stairs)
ON	ON	ON	ON	OFF	ON	ON	ON	Forge (Smithee)
ON	ON	ON	ON	OFF	ON	ON	OFF	Socker Boppers (Grim Reaper)
ON	ON	ON	OFF	ON	ON	ON	ON	Breathing Door (wind room)
ON	ON	ON	OFF	ON	ON	ON	OFF	Bedroom (closing wall)
ON	ON	ON	OFF	ON	ON	OFF	ON	Fire Room (lightning / bench over exit)
ON	ON	ON	OFF	ON	ON	OFF	OFF	Flying Barding
ON	ON	ON	OFF	ON	OFF	ON	ON	Chapel (Robot Knight / checkered floor)
ON	ON	ON	OFF	ON	OFF	ON	OFF	Mausoleum (Crypt Creeps)
ON	ON	ON	OFF	ON	OFF	OFF	ON	Catwalk (bats)
ON	ON	ON	OFF	ON	OFF	OFF	OFF	Ropes (reverse)
ON	ON	ON	OFF	OFF	ON	ON	ON	Yellow Brick Road (pool of water / spider) (reverse)
ON	ON	ON	OFF	OFF	ON	ON	OFF	Giant Bat
ON	ON	OFF	ON	ON	ON	ON	ON	Elevator Floor (9 stops)
ON	ON	OFF	ON	ON	ON	ON	OFF	Forge (Smithee) (reverse)
ON	ON	OFF	ON	ON	ON	OFF	ON	Flying Barding (reverse)
ON	ON	OFF	ON	ON	ON	OFF	OFF	The Lizard King
ON	ON	OFF	ON	ON	OFF	ON	ON	Wizard's Kitchen ("Drink Me")
ON	ON	OFF	ON	ON	OFF	ON	OFF	Mausoleum (Crypt Creeps) (reverse)
ON	ON	OFF	ON	ON	OFF	OFF	ON	Socker Boppers (Grim Reaper) (reverse)
ON	ON	OFF	ON	ON	OFF	OFF	OFF	Tilting Room
ON	ON	OFF	ON	OFF	ON	ON	ON	Throne Room
ON	ON	OFF	ON	OFF	ON	ON	OFF	Chapel (Robot Knight / checkered floor) (reverse)
ON	ON	OFF	OFF	ON	ON	ON	ON	Elevator Floor (9 stops) (reverse)
ON	ON	OFF	OFF	ON	ON	ON	OFF	Pirates of the Caribbean (underground river)
ON	ON	OFF	OFF	ON	ON	OFF	ON	Mudmen
ON	ON	OFF	OFF	ON	ON	OFF	OFF	Black Knight (on horse)
ON	ON	OFF	OFF	ON	OFF	ON	ON	Boulder Trench
ON	ON	OFF	OFF	ON	OFF	ON	OFF	Three Caves (geyser)
ON	ON	OFF	OFF	ON	OFF	OFF	ON	Dragon's Lair
ON	ON	OFF	OFF	OFF	ON	ON	ON	Elevator Floor (3 stops)
ON	ON	OFF	OFF	OFF	ON	ON	OFF	Castle Vestibule (small crumbling room)

Space Ace's engineering mode is activated by turning DIP switch B3 ON. You can then use DIP switch bank A to select the scene. Because of Space Ace's style of game play, the scene will not always start over at the beginning. You will not have the problem with the laserdisc player selection that you get with the Dragon's Lair revision F/F2 ROMs, because Space Ace uses DIP switch B0 for player selection.

A7	A6	A5	A4	A3	A2	A1	A0	Scene Name
ON	ON	ON	ON	ON	ON	ON	ON	Attract Mode
ON	ON	ON	ON	ON	ON	ON	OFF	"There's Borf's Ship"
ON	ON	ON	ON	ON	ON	OFF	ON	Flying Thru Grid Maze
ON	ON	ON	ON	ON	ON	OFF	OFF	Flying Thru Grid Maze (reverse)
ON	ON	ON	ON	ON	OFF	ON	ON	Space Station Level 1: Video Guards
ON	ON	ON	ON	ON	OFF	ON	OFF	Space Station Level 1: Video Guards (reverse)
ON	ON	ON	ON	ON	OFF	OFF	ON	Space Station Level 1: Security Spheres
ON	ON	ON	ON	ON	OFF	OFF	OFF	Space Station Level 1: Security Spheres (reverse)
ON	ON	ON	ON	OFF	ON	ON	ON	Space Station Level 2: Space Pups / Robots
ON	ON	ON	ON	OFF	ON	ON	OFF	Space Station Level 2: Space Pups / Robots (reverse)
ON	ON	ON	OFF	ON	ON	ON	ON	Space Station Level 2: Trash Masher
ON	ON	ON	OFF	ON	ON	ON	OFF	Space Station Level 2: Trash Masher (reverse)
ON	ON	ON	OFF	ON	ON	OFF	ON	Dogfight
ON	ON	ON	OFF	ON	ON	OFF	OFF	Dogfight (reverse)
ON	ON	ON	OFF	ON	OFF	ON	ON	Checkered Tunnel / Le Grins
ON	ON	ON	OFF	ON	OFF	ON	OFF	Checkered Tunnel / Le Grins (reverse)
ON	ON	ON	OFF	ON	OFF	OFF	ON	Shag's Jungle
ON	ON	ON	OFF	ON	OFF	OFF	OFF	Shag's Jungle (reverse)
ON	ON	ON	OFF	OFF	ON	ON	ON	Hexter
ON	ON	ON	OFF	OFF	ON	ON	ON	Hexter (reverse)
ON	ON	OFF	ON	ON	ON	ON	ON	Cycle Chase
ON	ON	OFF	ON	ON	ON	ON	OFF	Cycle Chase (reverse)
ON	ON	OFF	ON	ON	ON	OFF	ON	Roller Skates
ON	ON	OFF	ON	ON	ON	OFF	OFF	Roller Skates (reverse)
ON	ON	OFF	ON	ON	OFF	ON	ON	Final Battle with Borf
ON	ON	OFF	ON	ON	OFF	ON	OFF	"Which Way?" (water)
ON	ON	OFF	ON	ON	OFF	OFF	ON	"Which Way?"
ON	ON	OFF	ON	ON	OFF	OFF	OFF	Flying after Borf's ship
ON	ON	OFF	ON	OFF	ON	ON	ON	Flying after Borf's ship (reverse)
ON	ON	OFF	ON	OFF	ON	ON	OFF	Run thru door to Security Sphere
ON	ON	OFF	OFF	ON	ON	ON	ON	Run thru door to Security Sphere (reverse)
ON	ON	OFF	OFF	ON	ON	ON	OFF	Water tank
ON	ON	OFF	OFF	ON	ON	OFF	ON	Water tank (reverse)