furnace/papers/doc/7-systems/game-boy.md
2022-01-16 01:10:43 -05:00

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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.