From 8f71a37c560c3fa7af809157d58afa5015eaeaa9 Mon Sep 17 00:00:00 2001
From: Wilbert Pol <wilbert@jdg.info>
Date: Sat, 25 Aug 2012 12:45:03 +0000
Subject: [PATCH] Added BGx mode selection register (nw)

---
 src/emu/video/huc6272.c | 22 ++++++++++++++++++++++
 src/emu/video/huc6272.h |  1 +
 2 files changed, 23 insertions(+)

diff --git a/src/emu/video/huc6272.c b/src/emu/video/huc6272.c
index 08b2fd3e262..740f34d931e 100644
--- a/src/emu/video/huc6272.c
+++ b/src/emu/video/huc6272.c
@@ -208,6 +208,28 @@ WRITE32_MEMBER( huc6272_device::write )
 				m_page_setting = data;
 				break;
 
+			//
+			// xxxx ---- ---- ---- BG3 mode setting
+			// ---- xxxx ---- ---- BG2 mode setting
+			// ---- ---- xxxx ---- BG1 mode setting
+			// ---- ---- ---- xxxx BG0 mode setting
+			//
+			// 0001 - 4 color palette
+			// 0010 - 16 color palette
+			// 0011 - 256 color palette
+			// 0100 - 64k color
+			// 0101 - 16M color
+			// 1001 - 4 color palette block mode
+			// 1010 - 16 color palette block mode
+			// 1011 - 256 color palette block mode
+			// others - unused/invalid
+			case 0x10:
+				m_bgmode[0] = data & 0x0f;
+				m_bgmode[1] = ( data >> 4 ) & 0x0f;
+				m_bgmode[2] = ( data >> 8 ) & 0x0f;
+				m_bgmode[3] = ( data >> 12 ) & 0x0f;
+				break;
+
 			case 0x13:
 				m_micro_prg.addr = data & 0xf;
 				break;
diff --git a/src/emu/video/huc6272.h b/src/emu/video/huc6272.h
index fcde744bb63..114f97b8ce7 100644
--- a/src/emu/video/huc6272.h
+++ b/src/emu/video/huc6272.h
@@ -52,6 +52,7 @@ private:
 	UINT16 m_kram_inc_r,m_kram_inc_w;
 	UINT8 m_kram_page_r,m_kram_page_w;
 	UINT32 m_page_setting;
+	UINT8 m_bgmode[4];
 
 	struct{
 		UINT8 addr;