From 7165d39105fe89c56a6055d66db0af2d29574587 Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Mon, 17 Jan 2022 21:14:35 -0500
Subject: [PATCH] Neo Geo/AY: implement 20xx command

---
 src/engine/platform/ay.cpp     | 3 +++
 src/engine/platform/ay8930.cpp | 2 +-
 src/engine/platform/ym2610.cpp | 3 +++
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/engine/platform/ay.cpp b/src/engine/platform/ay.cpp
index 23de4a54..602fada4 100644
--- a/src/engine/platform/ay.cpp
+++ b/src/engine/platform/ay.cpp
@@ -195,6 +195,9 @@ int DivPlatformAY8910::dispatch(DivCommand c) {
       chan[c.chan].freqChanged=true;
       break;
     }
+    case DIV_CMD_STD_NOISE_MODE:
+      chan[c.chan].psgMode=(c.value+1)&7;
+      break;
     case DIV_CMD_STD_NOISE_FREQ:
       rWrite(0x06,31-c.value);
       break;
diff --git a/src/engine/platform/ay8930.cpp b/src/engine/platform/ay8930.cpp
index b59f71de..77ebf64c 100644
--- a/src/engine/platform/ay8930.cpp
+++ b/src/engine/platform/ay8930.cpp
@@ -224,7 +224,7 @@ int DivPlatformAY8930::dispatch(DivCommand c) {
     }
     case DIV_CMD_STD_NOISE_MODE:
       if (c.value<0x10) {
-        // TODO: channel mode
+        chan[c.chan].psgMode=(c.value+1)&7;
       } else {
         chan[c.chan].duty=c.value&15;
         immWrite(0x16,chan[c.chan].duty);
diff --git a/src/engine/platform/ym2610.cpp b/src/engine/platform/ym2610.cpp
index 1258a409..bf564821 100644
--- a/src/engine/platform/ym2610.cpp
+++ b/src/engine/platform/ym2610.cpp
@@ -449,6 +449,9 @@ int DivPlatformYM2610::dispatch(DivCommand c) {
       
       break;
     }
+    case DIV_CMD_STD_NOISE_MODE:
+      chan[c.chan].psgMode=(c.value+1)&7;
+      break;
     case DIV_CMD_STD_NOISE_FREQ:
       if (c.chan<4 || c.chan>6) break;
       rWrite(0x06,31-c.value);