From 320bebb4bec96acaf08142421d270205858d3957 Mon Sep 17 00:00:00 2001
From: freq-mod <32672779+freq-mod@users.noreply.github.com>
Date: Tue, 1 Feb 2022 21:15:05 +0100
Subject: [PATCH] Add 12xx duty cycle description (#101)

---
 papers/doc/7-systems/ay8930.md | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/papers/doc/7-systems/ay8930.md b/papers/doc/7-systems/ay8930.md
index 720ecf047..7344b8f0b 100644
--- a/papers/doc/7-systems/ay8930.md
+++ b/papers/doc/7-systems/ay8930.md
@@ -10,6 +10,15 @@ while emulation of this chip is mostly complete, the additional noise setup regi
 # effects
 
 - `12xx`: set channel duty cycle. `xx` is a value between 00 and 08.
+  - `00`: 3.125%
+  - `01`: 6.25%
+  - `02`: 12.5%
+  - `03`: 25%
+  - `04`: 50%
+  - `05`: 75%
+  - `06`: 87.5%
+  - `07`: 93.75%
+  - `08`: 96.875%
 - `20xx`: set channel mode. `xx` may be one of the following:
   - `00`: square
   - `01`: noise
@@ -43,4 +52,4 @@ while emulation of this chip is mostly complete, the additional noise setup regi
   - in this mode the envelope period is set to the channel's notes, multiplied by a fraction.
   - `x` is the numerator.
   - `y` is the denominator.
-  - if `x` or `y` are 0 this will disable auto-envelope mode.
\ No newline at end of file
+  - if `x` or `y` are 0 this will disable auto-envelope mode.