From bd06b5a1cca16765f4f032cc6b008fecb2ef6900 Mon Sep 17 00:00:00 2001
From: SarahW <pcem@pcem-emulator.co.uk>
Date: Wed, 11 Apr 2018 17:37:41 +0100
Subject: [PATCH] Add segment limit checking to opcode F6 (16-bit version) as
 temporary workaround for hang when opening Windows 9x DOS box on Diamond
 Stealth 32.

---
 src/x86_ops_misc.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/x86_ops_misc.h b/src/x86_ops_misc.h
index c8d31f5..4949b27 100644
--- a/src/x86_ops_misc.h
+++ b/src/x86_ops_misc.h
@@ -52,6 +52,10 @@ static int opF6_a16(uint32_t fetchdat)
         int8_t temps;
         
         fetch_ea_16(fetchdat);
+        if (cpu_mod != 3)
+        {
+                CHECK_READ(cpu_state.ea_seg, cpu_state.eaaddr, cpu_state.eaaddr);
+        }
         dst = geteab();                 if (cpu_state.abrt) return 1;
         switch (rmdat & 0x38)
         {