From cf6b213d2c6f2b0c01ca0701c5629eb287fdbb8b Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Wed, 9 Jun 2021 01:52:00 -0500
Subject: [PATCH] even more ancient version compatibility

---
 src/engine/engine.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index 57c626a02..4e0316670 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -542,9 +542,20 @@ bool DivEngine::load(void* f, size_t slen) {
           if (ds.system==DIV_SYSTEM_SMS && ds.version<0x0e && pat->data[k][1]>0) {
             // apparently it was up one octave before
             pat->data[k][1]--;
+          } else if (ds.system==DIV_SYSTEM_GENESIS && ds.version<0x0e && pat->data[k][1]>0 && i>5) {
+            // ditto
+            pat->data[k][1]--;
           }
           // volume
           pat->data[k][3]=reader.readS();
+          if (ds.version<0x0a) {
+            // back then volume was stored as 00-ff instead of 00-7f/0-f
+            if (i>5) {
+              pat->data[k][3]>>=4;
+            } else {
+              pat->data[k][3]>>=1;
+            }
+          }
           for (int l=0; l<chan->effectRows; l++) {
             // effect
             pat->data[k][4+(l<<1)]=reader.readS();