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update NES doc with mention of linear counter effe

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tildearrow 2023-05-05 01:29:54 -05:00
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papers/doc/7-systems/nes.md
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@ -42,6 +42,9 @@ also known as Famicom. it is a five-channel sound generator: first two channels
- `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.
- `19xx`: set triangle linear counter.
- `00` to `7F` set the counter.
- `80` and higher halt it.
- `20xx`: set DPCM frequency.
- only works in DPCM mode.
- see table below for possible values.