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furnace/doc/7-systems/game-boy.md
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Game Boy

the Nintendo Game Boy is one of the most successful portable game systems ever made.

with stereo sound, two pulse channels, a wave channel and a noise one it packed some serious punch.

effects

  • 10xx: change wave.
  • 11xx: set noise length. xx may be one of:
    • 0: long
    • 1: short
  • 12xx: set duty cycle (from 0 to 3).
  • 13xy: setup sweep (pulse channels only).
    • x is the time.
    • y is the shift.
    • set to 0 to disable it.
  • 14xx: set sweep direction. 0 is up and 1 is down.