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fix n163 doc 

256 bytes, not 128. https://www.nesdev.org/wiki/Namco_163_audio

also some better wording
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papers/doc/7-systems/n163.md
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# Namco 163 (also called N163, Namco C163, Namco 106 (sic), Namco 160 or Namco 129)
This is one of Namco's NES mappers, with up to 8 wavetable channels. It has also 128 byte of internal RAM, and both channel register and wavetables are stored here. Wavetables are variable size and freely allocable anywhere in RAM, it means it can use part of or continuously pre-loaded waveform and its sequences in RAM. But waveform RAM area becomes smaller as more channels are activated; as channel registers consumes 8 bytes for each channel. You must avoid conflict with channel register area and waveform for avoid broken channel playback.
This is one of Namco's NES mappers, with up to 8 wavetable channels. It has also 256 bytes of internal RAM, and both channel register and wavetables are stored here. Wavetables are variable in size and freely allocable anywhere in RAM, it means it can use part of or continuously pre-loaded waveform and its sequences in RAM. But waveform RAM area becomes smaller as more channels are activated; as channel registers consume 8 bytes for each channel. You must avoid conflict with channel register area and waveform to avoid broken channel playback.
It outputs only a single channel at clock; so its sound quality gets more crunchy as more channels are activated.