From e8b628402e3f67cbc5f5bb4ff99495623fbe3076 Mon Sep 17 00:00:00 2001
From: "Alex W. Jackson" <alex.w.jackson@gmail.com>
Date: Wed, 2 Apr 2014 22:07:31 +0000
Subject: [PATCH] replace assert with guessed behavior + logerror (nw)

---
 src/emu/cpu/i86/i86.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/emu/cpu/i86/i86.c b/src/emu/cpu/i86/i86.c
index af31690c43c..a093d4bbcbe 100644
--- a/src/emu/cpu/i86/i86.c
+++ b/src/emu/cpu/i86/i86.c
@@ -1354,8 +1354,8 @@ bool i8086_common_cpu_device::common_op(UINT8 op)
 
 		case 0x8c: // i_mov_wsreg
 			m_modrm = fetch();
-			assert(((m_modrm & 0x38) >> 3) >= 0 && ((m_modrm & 0x38) >> 3) < ARRAY_LENGTH(m_sregs));
-			PutRMWord(m_sregs[(m_modrm & 0x38) >> 3]);
+			PutRMWord(m_sregs[(m_modrm & 0x18) >> 3]); // guess: ignore bit 5
+			if(m_modrm & 0x20) logerror("%s: %06x: Mov Sreg - Invalid register\n", tag(), pc());
 			CLKM(MOV_RS,MOV_MS);
 			break;