|Control||8-way Joystick, 3 Buttons|
Alpha Mission (ASO: Armored Scrum Object in Japan) is an early vertically scrolling shoot-em-up set in space. 1 player or 2 player alternating gameplay.
Button 1 = Laser, Button 2 = Bomb, Button 3 = Power-up ship (Temporary, When available).
Enemies are air and ground targets, destroyed by Laser and Bomb respectively. Larger enemies will appear twice per level usually in gaps in the scenery.
Some ground targets leave lettered power-ups (or power-downs) when destroyed, others drop spaceship parts. Spaceship parts can be collected to form alternate ship types. Alternate ship types are activated when player collects enough 'E' letters. When this happens a trilling sound will repeat itself. Alternate ships are activated by pushing left and right to select from the display at the bottom of the screen and pushing the 3rd button. They have various powers in excess of the standard ship firepower.
The Video output levels of this PCB are slightly higher than most arcade PCBs. This can result in a 'smeared' picture especially when used with SCART TVs and monitors.