28 lines
789 B
Markdown
28 lines
789 B
Markdown
# Game Boy
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the Nintendo Game Boy is one of the most successful portable game systems ever made.
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with stereo sound, two pulse channels, a wave channel and a noise channel, it packed some serious punch.
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# effects
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- `10xx`: **change wave.**
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- `11xx`: **set noise length.**
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- `0`: long
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- `1`: short
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- `12xx`: **set duty cycle.**
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- `0`: 12.5%
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- `1`: 25%
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- `2`: 50%
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- `3`: 75%
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- `13xy`: **setup sweep.** pulse channels only.
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- `x` is the time.
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- `y` is the shift.
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- set to `0` to disable it.
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- `14xx`: **set sweep direction.** `0` is up and `1` is down.
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# links
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- [Gameboy sound hardware](https://gbdev.gg8.se/wiki/articles/Gameboy_sound_hardware) - detailed technical information
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- [GameBoy Sound Table](http://www.devrs.com/gb/files/sndtab.html) - note frequency table |