# NES

the console from Nintendo that plays Super Mario Bros. and helped revive the agonizing video game market in the US during mid-80s.

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.

# effects

- `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.
- `12xx`: set duty cycle or noise mode of channel.
  - may be 0-3 for the pulse channels and 0-1 for the noise channel.
- `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.
  - set to 0 to disable it.
- `18xx`: set PCM channel mode.
  - `00`: PCM (software).
  - `01`: DPCM (hardware).
  - when in DPCM mode, samples will sound muffled (due to its nature), availables pitches are limited and loop point is ignored.