From caa6f3091da1a3f8bbcd2771284ef9c9578092c1 Mon Sep 17 00:00:00 2001
From: MooingLemur <mooinglemur@users.noreply.github.com>
Date: Sat, 31 Aug 2024 11:05:34 -0700
Subject: [PATCH] ZSM: exclude keydown events on loop lookahead

---
 src/engine/export/zsm.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/engine/export/zsm.cpp b/src/engine/export/zsm.cpp
index 81c5021a0..d5786edd9 100644
--- a/src/engine/export/zsm.cpp
+++ b/src/engine/export/zsm.cpp
@@ -674,7 +674,10 @@ void DivExportZSM::run() {
         if (writes.size()>0)
           logD("zsmOps: Writing %d messages to chip %d",writes.size(),i);
         for (DivRegWrite& write: writes) {
-          if (i==YM) zsm.writeYM(write.addr&0xff,write.val);
+          if (i==YM) {
+            if (done && write.addr==0x08 && (write.val&0x78)>0) continue; // don't process keydown on lookahead
+            zsm.writeYM(write.addr&0xff,write.val);
+          }
           if (i==VERA) {
             if (done && write.addr>=64) continue; // don't process any PCM or sync events on the loop lookahead
             zsm.writePSG(write.addr&0xff,write.val);