From 2589709d1afbfa26a2270bd4bf7aa9a92f9da7f7 Mon Sep 17 00:00:00 2001 From: tildearrow Date: Tue, 22 Mar 2022 00:16:19 -0500 Subject: [PATCH] add doc for VERA chip --- papers/doc/7-systems/vera.md | 15 +++++++++++++++ 1 file changed, 15 insertions(+) create mode 100644 papers/doc/7-systems/vera.md diff --git a/papers/doc/7-systems/vera.md b/papers/doc/7-systems/vera.md new file mode 100644 index 00000000..7d1b09c4 --- /dev/null +++ b/papers/doc/7-systems/vera.md @@ -0,0 +1,15 @@ +# 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.