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add doc for VERA chip

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tildearrow 2022-03-22 00:16:19 -05:00
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# VERA
this is a video and sound generator chip used in the Commander X16, a modern 8-bit computer created by The 8-Bit Guy.
it has 16 channels of pulse/triangle/saw/noise and one stereo PCM channel.
currently Furnace does not support the PCM channel's stereo mode, though.
# effects
- `20xx`: set waveform. the following values are accepted:
- 0: pulse
- 1: saw
- 2: triangle
- 3: noise
- `22xx`: set duty cycle. `xx` may go from 0 to 3F.