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.**
- `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.