Sub Hunter (c) 1977 Taito.
An old 2-minute timed shoot'em up.

>>> TECHNICAL DETAILS
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Prom Stickers : DP
Main CPU : 8080 (@ 1.93356 Mhz)
Sound Chips : Samples
Screen orientation : Horizontal
Video resolution : 256 x 224 pixels
Screen refresh : 60.00 Hz
Palette colors : 64
Players : 1
Control : 2-way joystick
Buttons : 2

>>> TRIVIA
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This game is also known as 'Depthcharge' (Gremlin).

>>> OTHER GAME RESOURCES
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Game's rom.
Machine's picture.