diff --git a/doc/7-systems/README.md b/doc/7-systems/README.md
index 71285b52..294fdc9e 100644
--- a/doc/7-systems/README.md
+++ b/doc/7-systems/README.md
@@ -14,6 +14,7 @@ this is a list of sound chips that Furnace supports, including effects.
 - [Famicom Disk System](fds.md)
 - [Game Boy](game-boy.md)
 - [Konami K007232](k007232.md)
+- [Konami K056320](k056320.md)
 - [Konami SCC](scc.md)
 - [Konami VRC6](vrc6.md)
 - [Atari Lynx](lynx.md)
diff --git a/doc/7-systems/k056320.md b/doc/7-systems/k056320.md
new file mode 100644
index 00000000..bf659582
--- /dev/null
+++ b/doc/7-systems/k056320.md
@@ -0,0 +1,9 @@
+# Konami 056320
+
+the 056320 is a sample-based chip that featured in a number of Konami arcade games, notably _Sunset Riders_ and _Teenage Mutant Ninja Turtles: Turtles in Time_. it has four channels of audio and stereo output, and can access up to 2MB of samples in 8-bit PCM or 4-bit ADPCM formats.
+
+
+
+# effects
+
+- `DFxx`: Set sample playback direction. `0` is normal; `1` is reverse.