From b6e9eb17203f181fbbc2addde0dd839d77afc756 Mon Sep 17 00:00:00 2001
From: "R. Belmont" <rb6502@users.noreply.github.com>
Date: Mon, 28 Jan 2013 17:31:50 +0000
Subject: [PATCH] Fix pmac6100 regression caused by detagging (nw)

---
 src/mess/video/mac.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/mess/video/mac.c b/src/mess/video/mac.c
index c8d2239ef17..3fe0bbc5d8b 100644
--- a/src/mess/video/mac.c
+++ b/src/mess/video/mac.c
@@ -242,7 +242,14 @@ VIDEO_RESET_MEMBER(mac_state,macrbv)
 	visarea.min_x = 0;
 	visarea.min_y = 0;
 	view = 0;
-	m_rbv_montype = m_montype->read_safe(2);
+	if (m_montype)
+	{
+		m_rbv_montype = m_montype->read_safe(2);
+	}
+	else
+	{
+		m_rbv_montype = 2;
+	}
 	switch (m_rbv_montype)
 	{
 		case 1: // 15" portrait display