From a219ff2db0e710a7c0779020cd008bfa787579a4 Mon Sep 17 00:00:00 2001
From: Fabio Priuli <etabeta78@users.noreply.github.com>
Date: Fri, 22 Mar 2013 11:03:16 +0000
Subject: [PATCH] (MESS) speeding up slot implementation of the SVP add-on
 chip. nw.

---
 src/mess/machine/md_slot.c |  4 ++++
 src/mess/machine/md_slot.h |  1 +
 src/mess/machine/md_svp.c  | 19 +++++++++++++++----
 src/mess/machine/md_svp.h  |  1 +
 4 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/src/mess/machine/md_slot.c b/src/mess/machine/md_slot.c
index 15ed8cfc401..e6e6976655f 100644
--- a/src/mess/machine/md_slot.c
+++ b/src/mess/machine/md_slot.c
@@ -335,6 +335,10 @@ bool base_md_cart_slot_device::call_load()
 
 		if (res == IMAGE_INIT_PASS)
 		{
+			//speed-up rom access from SVP add-on, if present
+			if (m_type == SEGA_SVP)
+				m_cart->set_bank_to_rom("cart_svp", 0x800/2);
+
 			// STEP 3: install memory handlers for this type of cart
 			setup_custom_mappers();
 
diff --git a/src/mess/machine/md_slot.h b/src/mess/machine/md_slot.h
index c559dc23caf..7aa79fcc7ce 100644
--- a/src/mess/machine/md_slot.h
+++ b/src/mess/machine/md_slot.h
@@ -109,6 +109,7 @@ public:
 	virtual UINT16* get_nvram_base() { return m_nvram; };
 	virtual UINT32 get_rom_size() { return m_rom_size; };
 	virtual UINT32 get_nvram_size() { return m_nvram_size; };
+	virtual void set_bank_to_rom(const char *banktag, UINT32 offset) {};
 
 	void rom_map_setup(UINT32 size);
 	UINT32 get_padded_size(UINT32 size);
diff --git a/src/mess/machine/md_svp.c b/src/mess/machine/md_svp.c
index 8340ea2720e..b7b83277278 100644
--- a/src/mess/machine/md_svp.c
+++ b/src/mess/machine/md_svp.c
@@ -314,10 +314,10 @@ INPUT_PORTS_END
 //-------------------------------------------------
 
 ADDRESS_MAP_START( md_svp_ssp_map, AS_PROGRAM, 16, md_rom_svp_device )
-	AM_RANGE(0x0000, 0x03ff) AM_READ(rom_read1)
-	AM_RANGE(0x0400, 0xffff) AM_READ(rom_read2)
-//	AM_RANGE(0x0000, 0x03ff) AM_ROMBANK("bank3")
-//	AM_RANGE(0x0400, 0xffff) AM_ROMBANK("bank4")
+//	AM_RANGE(0x0000, 0x03ff) AM_READ(rom_read1)
+//	AM_RANGE(0x0400, 0xffff) AM_READ(rom_read2)
+	AM_RANGE(0x0000, 0x03ff) AM_ROMBANK("iram_svp")
+	AM_RANGE(0x0400, 0xffff) AM_ROMBANK("cart_svp")
 ADDRESS_MAP_END
 
 //-------------------------------------------------
@@ -361,6 +361,13 @@ ioport_constructor md_rom_svp_device::device_input_ports() const
 }
 
 
+void md_rom_svp_device::set_bank_to_rom(const char *banktag, UINT32 offset)
+{
+	if (membank(banktag))
+		membank(banktag)->set_base(m_rom + offset);
+}
+
+
 void md_rom_svp_device::device_start()
 {
 	memset(m_pmac_read, 0, ARRAY_LENGTH(m_pmac_read));
@@ -373,8 +380,12 @@ void md_rom_svp_device::device_start()
 	m_xst2 = 0;
 
 	/* SVP stuff */
+	// DRAM
 	m_dram = auto_alloc_array(machine(), UINT8, 0x20000);
+	// IRAM
 	m_iram = auto_alloc_array(machine(), UINT8, 0x800);
+	this->membank("iram_svp")->set_base(m_iram);
+	// the other bank, "cart_svp", is setup at call_load 
 }
 
 READ16_MEMBER(md_rom_svp_device::read)
diff --git a/src/mess/machine/md_svp.h b/src/mess/machine/md_svp.h
index f60e53ec0ea..48e50f8b48f 100644
--- a/src/mess/machine/md_svp.h
+++ b/src/mess/machine/md_svp.h
@@ -24,6 +24,7 @@ public:
 	virtual void device_config_complete() { m_shortname = "md_rom_svp"; }
 	virtual machine_config_constructor device_mconfig_additions() const;
 	virtual ioport_constructor device_input_ports() const;
+	virtual void set_bank_to_rom(const char *banktag, UINT32 offset);
 	
 	required_device<device_t> m_svp;
 	required_ioport m_test_ipt;