Speed Coin (prototype)

Stern Electronics’ Speed Coin is a unique puzzle game from 1984 that challenges players to guide a coin through a vertical playfield. Using a two-way joystick, the player tilts the platform upon which the coin rests, attempting to maneuver it down toward a hole at the bottom of the screen. The core challenge lies in ensuring the coin remains intact throughout its descent; breakage results in game over. Successful completion within certain time limits awards bonus multipliers, enhancing the score based on speed and precision. While seemingly straightforward, Speed Coin offers surprisingly addictive gameplay with a quick learning curve that encourages friendly competition among multiple players watching and cheering. The game utilizes two Zilog Z80 processors alongside General Instrument AY8910 sound chips to create its distinct audio-visual experience. The 224x256 resolution screen displays the action at a refresh rate of approximately 60.61 Hz, presenting a colorful environment with a palette of 99 different hues. Designed by Thomas Baron and programmed by Keith Enge, Speed Coin provides a compact yet engaging arcade experience focused on skillful manipulation and timing.