Demon (c) 1982 Rock-ola.
An old overhead-view shoot'em up game.

>>> TECHNICAL DETAILS
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Main CPU : CCPU (@ 5 Mhz)
Sound CPU : Z80 (@ 3.579545 Mhz)
Sound Chips : (3x) AY8910 (@ 3.579545 Mhz)
Screen orientation : Horizontal
Video resolution : 224 x 256 pixels
Screen refresh : 38.00 Hz
Palette colors : 32768
Players : 2
Control : 2-way joystick
Buttons : 3

>>> TRIVIA
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Demon was created on Cinematronics' vector hardware by Rock-Ola. The flickering is normal :)
- SCORING -
Collecting a crystal : 100 points.
Dropping a crystal in the shuttle : 100, 200, 300 etc up to 1,000 points then back to 100 points.
Each second survived : 10 points.
Destroying large alien with tail : 1,500 points.
Off centre hit on large alien : up to 1,300 points.
Destroying a mutated crystal : 400 points.

>>> TRICKS AND TIPS
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* At the start of the game, concentrate on loading as many crystals as you can. Don't worry about the enemy ships yet as they are easy to avoid.
* The mutated aliens with the tails which appear later in the game are worth the most points. You get 1,500 for a direct hit destroying them, but also points for each near non-fatal hit. Get a few hits off-target if you can, as they can be worth 1,300 points each!
* Keep an eye on your shot power remaining and be ready to collect a crystal if necessary to recharge.
* If the shuttle appears on screen level with the bottom block, keep collecting crystals and don't drop any off until the shuttle is clear of the block. You can often lose a life if you are carrying a crystal and can't get to the shuttle before it explodes.

>>> OTHER GAME RESOURCES
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Game's rom.
Machine's picture.
Arcade Retro Lounge; http://tips.retrogames.com/