From 0f71a56edbec75ae41482db287bb45bebb245df7 Mon Sep 17 00:00:00 2001
From: OBattler <oubattler@gmail.com>
Date: Wed, 24 Apr 2024 06:47:03 +0200
Subject: [PATCH] Some checks around a recalctimings check to fix some crashes.

---
 src/video/vid_mga.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/video/vid_mga.c b/src/video/vid_mga.c
index bbba9ca6f..aec571356 100644
--- a/src/video/vid_mga.c
+++ b/src/video/vid_mga.c
@@ -816,7 +816,10 @@ mystique_out(uint16_t addr, uint8_t val, void *priv)
                     }
                 }
             }
-            svga_recalctimings(svga);
+            if (!((mystique->type >= MGA_1064SG) && (mystique->crtcext_idx == 0) &&
+                (mystique->crtcext_regs[3] & CRTCX_R3_MGAMODE)))
+                svga_recalctimings(svga);
+
             break;
 
         default: