furnace/papers/doc/7-systems/game-boy.md

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.