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

Game Boy

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

it has stereo sound, two pulse channels, a wave channel and a noise channel.

effects

• 10xx: change wave.
• 11xx: set noise length.
  • 0: long
  • 1: short
• 12xx: set duty cycle.
  • 0: 12.5%
  • 1: 25%
  • 2: 50%
  • 3: 75%
• 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.

info

this chip uses the Game Boy instrument editor.

links

• Gameboy sound hardware - detailed technical information

• GameBoy Sound Table - note frequency table