From 5b2ec3ee8791825a434c7e2cf47e5ce56bee1373 Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Mon, 14 Mar 2022 00:26:06 -0500
Subject: [PATCH] NES: fix slide up

fixes #208
---
 src/engine/platform/nes.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/engine/platform/nes.cpp b/src/engine/platform/nes.cpp
index 897d8e84..06fbc725 100644
--- a/src/engine/platform/nes.cpp
+++ b/src/engine/platform/nes.cpp
@@ -201,6 +201,7 @@ void DivPlatformNES::tick() {
       } else {
         chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true)-1;
         if (chan[i].freq>2047) chan[i].freq=2047;
+        if (chan[i].freq<0) chan[i].freq=0;
       }
       if (chan[i].keyOn) {
         //rWrite(16+i*5+1,((chan[i].duty&3)<<6)|(63-(ins->gb.soundLen&63)));