19 lines
743 B
Markdown
19 lines
743 B
Markdown
# NES
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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 PSG: 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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- `12xx`: set duty cycle or noise mode of channel.
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- may be 0-3 for the pulse channels and 0-1 for the noise channel.
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- `13xy`: setup sweep up.
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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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- `14xy`: setup sweep down.
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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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