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# NES
the console from Nintendo that plays Super Mario Bros. and helped revive the agonizing video game market in the US during mid-80s.
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also known as Famicom. it is a five-channel sound generator: first two channels play pulse wave with three different duty cycles, third is a fixed-volume triangle channel, fourth is a noise channel (can work in both pseudo-random and periodic modes) and fifth is a (D)PCM sample channel.
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# effects
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- `11xx` : write to delta modulation counter.
- this may be used to attenuate the triangle and noise channels.
- will not work if a sample is playing.
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- `12xx` : set duty cycle or noise mode of channel.
- may be 0-3 for the pulse channels and 0-1 for the noise channel.
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- `13xy` : setup sweep up.
- `x` is the time.
- `y` is the shift.
- set to 0 to disable it.
- `14xy` : setup sweep down.
- `x` is the time.
- `y` is the shift.
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- set to 0 to disable it.
- `18xx` : set PCM channel mode.
- `00` : PCM (software).
- `01` : DPCM (hardware).
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- when in DPCM mode, samples will sound muffled (due to its nature), availables pitches are limited and loop point is ignored.
