From 05a8b65ec66d00f7dd5f2a0b6ee48eb1f98be77e Mon Sep 17 00:00:00 2001
From: tildearrow <me@tildearrow.org>
Date: Mon, 5 Feb 2024 13:07:38 -0500
Subject: [PATCH] fix .dmp saving for OPM and NES

to-do: which system is PCE, NES and OPM?
---
 src/engine/instrument.cpp | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/engine/instrument.cpp b/src/engine/instrument.cpp
index 31be38638..754bcfd2a 100644
--- a/src/engine/instrument.cpp
+++ b/src/engine/instrument.cpp
@@ -3678,15 +3678,18 @@ bool DivInstrument::saveDMP(const char* path) {
   // guess the system
   switch (type) {
     case DIV_INS_FM:
-      // we can't tell between Genesis, Neo Geo and Arcade ins type yet
+      // we can't tell Genesis and Neo Geo apart
       w->writeC(0x02);
       w->writeC(1);
       break;
     case DIV_INS_STD:
-      // we can't tell between SMS and NES ins type yet
       w->writeC(0x03);
       w->writeC(0);
       break;
+    case DIV_INS_NES:
+      w->writeC(0x06);
+      w->writeC(0);
+      break;
     case DIV_INS_GB:
       w->writeC(0x04);
       w->writeC(0);
@@ -3696,7 +3699,7 @@ bool DivInstrument::saveDMP(const char* path) {
       w->writeC(0);
       break;
     case DIV_INS_PCE:
-      w->writeC(0x06);
+      w->writeC(0x05);
       w->writeC(0);
       break;
     case DIV_INS_OPLL:
@@ -3704,6 +3707,10 @@ bool DivInstrument::saveDMP(const char* path) {
       w->writeC(0x13);
       w->writeC(1);
       break;
+    case DIV_INS_OPM:
+      w->writeC(0x08);
+      w->writeC(1);
+      break;
     case DIV_INS_OPZ:
       // data will be lost
       w->writeC(0x08);
@@ -3720,7 +3727,7 @@ bool DivInstrument::saveDMP(const char* path) {
       return false;
   }
 
-  if (type==DIV_INS_FM || type==DIV_INS_OPLL || type==DIV_INS_OPZ) {
+  if (type==DIV_INS_FM || type==DIV_INS_OPM || type==DIV_INS_OPLL || type==DIV_INS_OPZ) {
     w->writeC(fm.fms);
     w->writeC(fm.fb);
     w->writeC(fm.alg);