okim6295: Directly use set_rom_bank [O. Galibert]

dirom: Add a mandatory callback on bank change [O. Galibert]

src/devices/sound/bsmt2000.cpp

@@ -204,6 +204,16 @@ void bsmt2000_device::sound_stream_update(sound_stream &stream, stream_sample_t
 }
 
 
+//-------------------------------------------------
+//  rom_bank_updated - the rom bank has changed
+//-------------------------------------------------
+
+void bsmt2000_device::rom_bank_updated()
+{
+	m_stream->update();
+}
+
+
 //-------------------------------------------------
 //  read_status - return the write pending status
 //-------------------------------------------------

src/devices/sound/bsmt2000.h

@@ -64,6 +64,9 @@ protected:
 	// device_sound_interface overrides
 	virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
 
+	// device_rom_interface overrides
+	virtual void rom_bank_updated() override;
+
 public:
 	// internal TMS I/O callbacks
 	DECLARE_READ16_MEMBER( tms_register_r );

src/devices/sound/c352.cpp

@@ -40,6 +40,16 @@ c352_device::c352_device(const machine_config &mconfig, const char *tag, device_
 {
 }
 
+
+//-------------------------------------------------
+//  rom_bank_updated - the rom bank has changed
+//-------------------------------------------------
+
+void c352_device::rom_bank_updated()
+{
+	m_stream->update();
+}
+
 //-------------------------------------------------
 //  static_set_dividder - configuration helper to
 //  set the divider setting

src/devices/sound/c352.h

@@ -47,6 +47,9 @@ protected:
 	// device_sound_interface overrides
 	virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
 
+	// device_rom_interface overrides
+	virtual void rom_bank_updated() override;
+
 private:
 	enum {
 		C352_FLG_BUSY       = 0x8000,   // channel is busy

src/devices/sound/es5503.cpp

@@ -82,6 +82,15 @@ void es5503_device::device_timer(emu_timer &timer, device_timer_id tid, int para
 	m_stream->update();
 }
 
+//-------------------------------------------------
+//  rom_bank_updated - the rom bank has changed
+//-------------------------------------------------
+
+void es5503_device::rom_bank_updated()
+{
+	m_stream->update();
+}
+
 // halt_osc: handle halting an oscillator
 // chip = chip ptr
 // onum = oscillator #

src/devices/sound/es5503.h

@@ -50,6 +50,9 @@ protected:
 	// device_sound_interface overrides
 	virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
 
+	// device_rom_interface overrides
+	virtual void rom_bank_updated() override;
+
 	devcb_write_line   m_irq_func;
 	devcb_read8        m_adc_func;
 

src/devices/sound/k053260.cpp

@@ -114,6 +114,16 @@ void k053260_device::device_reset()
 }
 
 
+//-------------------------------------------------
+//  rom_bank_updated - the rom bank has changed
+//-------------------------------------------------
+
+void k053260_device::rom_bank_updated()
+{
+	m_stream->update();
+}
+
+
 READ8_MEMBER( k053260_device::main_read )
 {
 	// sub-to-main ports

src/devices/sound/k053260.h

@@ -52,6 +52,9 @@ protected:
 	// sound stream update overrides
 	virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
 
+	// device_rom_interface overrides
+	virtual void rom_bank_updated() override;
+
 private:
 	// configuration
 	sound_stream *  m_stream;

src/devices/sound/multipcm.cpp

@@ -727,3 +727,13 @@ void multipcm_device::sound_stream_update(sound_stream &stream, stream_sample_t
 		datap[1][i] = clamp_to_int16(smpr);
 	}
 }
+
+
+//-------------------------------------------------
+//  rom_bank_updated - the rom bank has changed
+//-------------------------------------------------
+
+void multipcm_device::rom_bank_updated()
+{
+	m_stream->update();
+}

src/devices/sound/multipcm.h

@@ -26,6 +26,9 @@ protected:
 	// sound stream update overrides
 	virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
 
+	// device_rom_interface overrides
+	virtual void rom_bank_updated() override;
+
 private:
 	struct sample_t
 	{

src/devices/sound/okim6295.cpp

@@ -86,8 +86,6 @@ okim6295_device::okim6295_device(const machine_config &mconfig, const char *tag,
 		device_rom_interface(mconfig, *this, 18),
 		m_region(*this, DEVICE_SELF),
 		m_command(-1),
-		m_bank_installed(false),
-		m_bank_offs(0),
 		m_stream(nullptr),
 		m_pin7_state(0)
 {
@@ -117,7 +115,6 @@ void okim6295_device::device_start()
 	m_stream = machine().sound().stream_alloc(*this, 0, 1, clock() / divisor);
 
 	save_item(NAME(m_command));
-	save_item(NAME(m_bank_offs));
 	save_item(NAME(m_pin7_state));
 
 	for (int voicenum = 0; voicenum < OKIM6295_VOICES; voicenum++)
@@ -151,9 +148,6 @@ void okim6295_device::device_reset()
 
 void okim6295_device::device_post_load()
 {
-	if (m_bank_offs != 0)
-		set_bank_base(m_bank_offs, true);
-
 	device_clock_changed();
 }
 
@@ -187,21 +181,12 @@ void okim6295_device::sound_stream_update(sound_stream &stream, stream_sample_t
 
 
 //-------------------------------------------------
-//  set_bank_base - old-style bank management;
-//  assumes multiple 256k banks
+//  rom_bank_updated - the rom bank has changed
 //-------------------------------------------------
 
-void okim6295_device::set_bank_base(offs_t base, bool bDontUpdateStream)
+void okim6295_device::rom_bank_updated()
 {
-	// flush out anything pending (but not on e.g. a state load)
-	if (!bDontUpdateStream)
-	{
-		m_stream->update();
-	}
-
-	m_bank_offs = base;
-
-	set_rom_bank(m_bank_offs / 0x40000);
+	m_stream->update();
 }
 
 

src/devices/sound/okim6295.h

@@ -64,7 +64,6 @@ public:
 	static void static_set_pin7(device_t &device, int pin7);
 
 	// runtime configuration
-	void set_bank_base(offs_t base, bool bDontUpdateStream = false);
 	void set_pin7(int pin7);
 
 	UINT8 read_status();
@@ -83,6 +82,9 @@ protected:
 	// device_sound_interface overrides
 	virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
 
+	// device_rom_interface overrides
+	virtual void rom_bank_updated() override;
+
 	// a single voice
 	class okim_voice
 	{
@@ -106,8 +108,6 @@ protected:
 
 	okim_voice          m_voice[OKIM6295_VOICES];
 	INT32               m_command;
-	bool                m_bank_installed;
-	offs_t              m_bank_offs;
 	sound_stream *      m_stream;
 	UINT8               m_pin7_state;
 

src/devices/sound/okim9810.cpp

@@ -160,6 +160,16 @@ void okim9810_device::device_clock_changed()
 
 
 
+//-------------------------------------------------
+//  rom_bank_updated - the rom bank has changed
+//-------------------------------------------------
+
+void okim9810_device::rom_bank_updated()
+{
+	m_stream->update();
+}
+
+
 //-------------------------------------------------
 //  stream_generate - handle update requests for
 //  our sound stream

src/devices/sound/okim9810.h

@@ -92,6 +92,9 @@ protected:
 	// device_sound_interface overrides
 	virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
 
+	// device_rom_interface overrides
+	virtual void rom_bank_updated() override;
+
 	// a single voice
 	class okim_voice
 	{

src/devices/sound/qs1000.cpp

@@ -212,6 +212,16 @@ machine_config_constructor qs1000_device::device_mconfig_additions() const
 }
 
 
+//-------------------------------------------------
+//  rom_bank_updated - the rom bank has changed
+//-------------------------------------------------
+
+void qs1000_device::rom_bank_updated()
+{
+	m_stream->update();
+}
+
+
 //-------------------------------------------------
 //  device_start - device-specific startup
 //-------------------------------------------------

src/devices/sound/qs1000.h

@@ -85,6 +85,9 @@ protected:
 	// device_sound_interface overrides
 	virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
 
+	// device_rom_interface overrides
+	virtual void rom_bank_updated() override;
+
 public:
 	DECLARE_WRITE8_MEMBER( wave_w );
 

src/devices/sound/segapcm.cpp

@@ -55,6 +55,17 @@ void segapcm_device::device_start()
 }
 
 
+
+//-------------------------------------------------
+//  rom_bank_updated - the rom bank has changed
+//-------------------------------------------------
+
+void segapcm_device::rom_bank_updated()
+{
+	m_stream->update();
+}
+
+
 //-------------------------------------------------
 //  sound_stream_update - handle a stream update
 //-------------------------------------------------

src/devices/sound/segapcm.h

@@ -55,6 +55,9 @@ protected:
 	// sound stream update overrides
 	virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
 
+	// device_rom_interface overrides
+	virtual void rom_bank_updated() override;
+
 private:
 	std::unique_ptr<UINT8[]> m_ram;
 	UINT8 m_low[16];

src/devices/sound/vlm5030.cpp

@@ -263,6 +263,11 @@ void vlm5030_device::device_reset()
 	setup_parameter( 0x00);
 }
 
+void vlm5030_device::rom_bank_updated()
+{
+	m_channel->update();
+}
+
 int vlm5030_device::get_bits(int sbit,int bits)
 {
 	int offset = m_address + (sbit>>3);

src/devices/sound/vlm5030.h

@@ -35,6 +35,9 @@ protected:
 	// sound stream update overrides
 	virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
 
+	// device_rom_interface overrides
+	virtual void rom_bank_updated() override;
+
 private:
 	// configuration state
 	const address_space_config m_space_config;

src/devices/sound/ymf278b.cpp

@@ -841,6 +841,11 @@ void ymf278b_device::device_stop()
 	m_ymf262 = nullptr;
 }
 
+void ymf278b_device::rom_bank_updated()
+{
+	m_stream->update();
+}
+
 void ymf278b_device::precompute_rate_tables()
 {
 	int i;

src/devices/sound/ymf278b.h

@@ -39,6 +39,9 @@ protected:
 	// sound stream update overrides
 	virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
 
+	// device_rom_interface overrides
+	virtual void rom_bank_updated() override;
+
 private:
 	struct YMF278BSlot
 	{

src/emu/dirom.cpp

@@ -16,6 +16,10 @@ const address_space_config *device_rom_interface::memory_space_config(address_sp
 	return spacenum ? nullptr : &m_rom_config;
 }
 
+void device_rom_interface::rom_bank_updated()
+{
+}
+
 void device_rom_interface::set_rom_bank(int bank)
 {
 	if(!m_bank)
@@ -28,6 +32,7 @@ void device_rom_interface::set_rom_bank(int bank)
 
 	m_cur_bank = bank;
 	m_bank->set_entry(bank);
+	rom_bank_updated();
 }
 
 void device_rom_interface::reset_bank()

src/emu/dirom.h

@@ -31,6 +31,9 @@ public:
 	void set_rom(const void *base, UINT32 size);
 	void set_rom_bank(int bank);
 
+protected:
+	virtual void rom_bank_updated() = 0;
+
 private:
 	const address_space_config m_rom_config;
 	direct_read_data *m_rom_direct;

src/mame/drivers/1945kiii.cpp

@@ -154,8 +154,8 @@ WRITE16_MEMBER(k3_state::k3_scrolly_w)
 
 WRITE16_MEMBER(k3_state::k3_soundbanks_w)
 {
-	m_oki2->set_bank_base((data & 4) ? 0x40000 : 0);
-	m_oki1->set_bank_base((data & 2) ? 0x40000 : 0);
+	m_oki2->set_rom_bank((data & 4) >> 2);
+	m_oki1->set_rom_bank((data & 2) >> 1);
 }
 
 WRITE16_MEMBER(k3_state::flagrall_soundbanks_w)
@@ -176,7 +176,7 @@ WRITE16_MEMBER(k3_state::flagrall_soundbanks_w)
 	if (data & 0xfcc9)
 		popmessage("unk control %04x", data & 0xfcc9);
 
-	m_oki1->set_bank_base(0x40000 * ((data & 0x6)>>1) );
+	m_oki1->set_rom_bank((data & 0x6) >> 1);
 
 }
 

src/mame/drivers/30test.cpp

@@ -130,7 +130,7 @@ READ8_MEMBER(namco_30test_state::hc11_okibank_r)
 WRITE8_MEMBER(namco_30test_state::hc11_okibank_w)
 {
 	m_oki_bank = data;
-	m_oki->set_bank_base((data & 1) ? 0x40000 : 0);
+	m_oki->set_rom_bank(data & 1);
 }
 
 

src/mame/drivers/3x3puzzl.cpp

@@ -155,7 +155,7 @@ WRITE16_MEMBER(_3x3puzzle_state::gfx_ctrl_w)
 	if ( (data&0x06) != m_oki_bank )
 	{
 		m_oki_bank = data &0x6;
-		m_oki->set_bank_base((m_oki_bank>>1) * 0x40000);
+		m_oki->set_rom_bank(m_oki_bank >> 1);
 	}
 }
 

src/mame/drivers/acommand.cpp

@@ -418,8 +418,8 @@ WRITE16_MEMBER(acommand_state::ac_devices_w)
 		case 0x00/2:
 			if (ACCESSING_BITS_0_7)
 			{
-				m_oki1->set_bank_base(0x40000 * (data & 0x3));
-				m_oki2->set_bank_base(0x40000 * (data & 0x30) >> 4);
+				m_oki1->set_rom_bank(data & 0x3);
+				m_oki2->set_rom_bank((data & 0x30) >> 4);
 			}
 			break;
 		case 0x14/2:

src/mame/drivers/aerofgt.cpp

@@ -114,7 +114,7 @@ WRITE8_MEMBER(aerofgt_state::aerofgt_sh_bankswitch_w)
 
 WRITE16_MEMBER(aerofgt_state::pspikesb_oki_banking_w)
 {
-	m_oki->set_bank_base(0x40000 * (data & 3));
+	m_oki->set_rom_bank(data & 3);
 }
 
 /*TODO: sound banking. */

src/mame/drivers/arcadecl.cpp

@@ -131,7 +131,7 @@ WRITE16_MEMBER(arcadecl_state::latch_w)
 	/* lower byte being modified? */
 	if (ACCESSING_BITS_0_7)
 	{
-		m_oki->set_bank_base((data & 0x80) ? 0x40000 : 0x00000);
+		m_oki->set_rom_bank((data >> 7) & 1);
 		m_oki->set_output_gain(ALL_OUTPUTS, (data & 0x001f) / 31.0f);
 	}
 }

src/mame/drivers/artmagic.cpp

@@ -99,7 +99,7 @@ WRITE16_MEMBER(artmagic_state::control_w)
 	/* OKI banking here */
 	if (offset == 0)
 	{
-		m_oki->set_bank_base((((data >> 4) & 1) * 0x40000) % m_oki_region->bytes());
+		m_oki->set_rom_bank((data >> 4) & 1);
 	}
 
 	logerror("%06X:control_w(%d) = %04X\n", space.device().safe_pc(), offset, data);

src/mame/drivers/astrcorp.cpp

@@ -205,7 +205,7 @@ WRITE16_MEMBER(astrocorp_state::astrocorp_sound_bank_w)
 {
 	if (ACCESSING_BITS_8_15)
 	{
-		m_oki->set_bank_base(0x40000 * ((data >> 8) & 1));
+		m_oki->set_rom_bank((data >> 8) & 1);
 //      logerror("CPU #0 PC %06X: OKI bank %08X\n", space.device().safe_pc(), data);
 	}
 }
@@ -214,7 +214,7 @@ WRITE16_MEMBER(astrocorp_state::skilldrp_sound_bank_w)
 {
 	if (ACCESSING_BITS_0_7)
 	{
-		m_oki->set_bank_base(0x40000 * (data & 1));
+		m_oki->set_rom_bank(data & 1);
 //      logerror("CPU #0 PC %06X: OKI bank %08X\n", space.device().safe_pc(), data);
 	}
 }

src/mame/drivers/bestleag.cpp

@@ -239,7 +239,7 @@ WRITE16_MEMBER(bestleag_state::fgram_w)
 
 WRITE16_MEMBER(bestleag_state::oki_bank_w)
 {
-	m_oki->set_bank_base(0x40000 * ((data & 3) - 1));
+	m_oki->set_rom_bank((data - 1) & 3);
 }
 
 

src/mame/drivers/boogwing.cpp

@@ -298,8 +298,8 @@ GFXDECODE_END
 
 WRITE8_MEMBER(boogwing_state::sound_bankswitch_w)
 {
-	m_oki2->set_bank_base(((data & 2) >> 1) * 0x40000);
-	m_oki1->set_bank_base((data & 1) * 0x40000);
+	m_oki2->set_rom_bank((data & 2) >> 1);
+	m_oki1->set_rom_bank(data & 1);
 }
 
 

src/mame/drivers/cave.cpp

@@ -856,7 +856,7 @@ WRITE16_MEMBER(cave_state::ppsatan_out_w)
 		output().set_led_value(6, data & 0x0400);    // not tested in service mode
 		output().set_led_value(7, data & 0x0800);    // not tested in service mode
 
-		m_oki->set_bank_base((data & 0x8000) ? 0x40000 : 0);
+		m_oki->set_rom_bank((data & 0x8000) >> 15);
 	}
 
 //  popmessage("OUT %04x", data);

src/mame/drivers/cesclass.cpp

@@ -114,7 +114,7 @@ WRITE16_MEMBER( cesclassic_state::outputs_w )
 	--x- ---- probably screen enable
 	---- --x- coin counter
 	*/
-	m_oki->set_bank_base((data & 0x40) ? 0x40000 : 0);
+	m_oki->set_rom_bank((data & 0x40) >> 6);
 	machine().bookkeeping().coin_counter_w(0, data & 2);
 	if(data & ~0x62)
 	logerror("Output: %02x\n",data);

src/mame/drivers/cischeat.cpp

@@ -410,8 +410,8 @@ WRITE16_MEMBER(cischeat_state::scudhamm_oki_bank_w)
 {
 	if (ACCESSING_BITS_0_7)
 	{
-		m_oki1->set_bank_base(0x40000 * ((data >> 0) & 0x3) );
-		m_oki2->set_bank_base(0x40000 * ((data >> 4) & 0x3) );
+		m_oki1->set_rom_bank((data >> 0) & 0x3);
+		m_oki2->set_rom_bank((data >> 4) & 0x3);
 	}
 }
 
@@ -758,8 +758,8 @@ WRITE16_MEMBER(cischeat_state::bigrun_soundbank_w)
 {
 	if (ACCESSING_BITS_0_7)
 	{
-		m_oki1->set_bank_base(0x40000 * ((data >> 0) & 1) );
-		m_oki2->set_bank_base(0x40000 * ((data >> 4) & 1) );
+		m_oki1->set_rom_bank((data >> 0) & 1);
+		m_oki2->set_rom_bank((data >> 4) & 1);
 	}
 }
 
@@ -780,13 +780,14 @@ ADDRESS_MAP_END
 
 WRITE16_MEMBER(cischeat_state::cischeat_soundbank_1_w)
 {
-	if (ACCESSING_BITS_0_7) m_oki1->set_bank_base(0x40000 * (data & 1) );
+	if (ACCESSING_BITS_0_7) m_oki1->set_rom_bank(data & 1);
 }
 
 WRITE16_MEMBER(cischeat_state::cischeat_soundbank_2_w)
 {
-	if (ACCESSING_BITS_0_7) m_oki2->set_bank_base(0x40000 * (data & 1) );
+	if (ACCESSING_BITS_0_7) m_oki2->set_rom_bank(data & 1);
 }
+
 static ADDRESS_MAP_START( cischeat_sound_map, AS_PROGRAM, 16, cischeat_state )
 	AM_RANGE(0x000000, 0x03ffff) AM_ROM                                                 // ROM
 	AM_RANGE(0x040002, 0x040003) AM_WRITE(cischeat_soundbank_1_w)               // Sample Banking

src/mame/drivers/cninja.cpp

@@ -782,7 +782,7 @@ GFXDECODE_END
 WRITE8_MEMBER(cninja_state::sound_bankswitch_w)
 {
 	/* the second OKIM6295 ROM is bank switched */
-	m_oki2->set_bank_base((data & 1) * 0x40000);
+	m_oki2->set_rom_bank(data & 1);
 }
 
 /**********************************************************************************/

src/mame/drivers/dassault.cpp

@@ -523,7 +523,7 @@ GFXDECODE_END
 WRITE8_MEMBER(dassault_state::sound_bankswitch_w)
 {
 	/* the second OKIM6295 ROM is bank switched */
-	m_oki2->set_bank_base((data & 1) * 0x40000);
+	m_oki2->set_rom_bank(data & 1);
 }
 
 /**********************************************************************************/

src/mame/drivers/ddenlovr.cpp

@@ -1808,14 +1808,14 @@ WRITE16_MEMBER(ddenlovr_state::ddenlovr16_transparency_mask_w)
 
 WRITE8_MEMBER(ddenlovr_state::quizchq_oki_bank_w )
 {
-	m_oki->set_bank_base((data & 1) * 0x40000);
+	m_oki->set_rom_bank(data & 1);
 }
 
 WRITE16_MEMBER(ddenlovr_state::ddenlovr_oki_bank_w )
 {
 	if (ACCESSING_BITS_0_7)
 	{
-		m_oki->set_bank_base((data & 7) * 0x40000);
+		m_oki->set_rom_bank(data & 7);
 	}
 }
 
@@ -1826,7 +1826,7 @@ WRITE16_MEMBER(ddenlovr_state::quiz365_oki_bank1_w )
 	if (ACCESSING_BITS_0_7)
 	{
 		m_okibank = (m_okibank & 2) | (data & 1);
-		m_oki->set_bank_base(m_okibank * 0x40000);
+		m_oki->set_rom_bank(m_okibank);
 	}
 }
 
@@ -1835,7 +1835,7 @@ WRITE16_MEMBER(ddenlovr_state::quiz365_oki_bank2_w )
 	if (ACCESSING_BITS_0_7)
 	{
 		m_okibank = (m_okibank & 1) | ((data & 1) << 1);
-		m_oki->set_bank_base(m_okibank * 0x40000);
+		m_oki->set_rom_bank(m_okibank);
 	}
 }
 
@@ -2078,7 +2078,7 @@ READ16_MEMBER(ddenlovr_state::ddenlovrk_protection2_r)
 WRITE16_MEMBER(ddenlovr_state::ddenlovrk_protection2_w)
 {
 	COMBINE_DATA(m_protection2);
-	m_oki->set_bank_base(((*m_protection2) & 0x7) * 0x40000);
+	m_oki->set_rom_bank((*m_protection2) & 0x7);
 }
 
 static ADDRESS_MAP_START( ddenlovrk_map, AS_PROGRAM, 16, ddenlovr_state )
@@ -2199,7 +2199,7 @@ WRITE16_MEMBER(ddenlovr_state::nettoqc_oki_bank_w )
 {
 	if (ACCESSING_BITS_0_7)
 	{
-		m_oki->set_bank_base((data & 3) * 0x40000);
+		m_oki->set_rom_bank(data & 3);
 	}
 }
 
@@ -2249,7 +2249,7 @@ READ16_MEMBER(ddenlovr_state::ultrchmp_protection2_r)
 WRITE16_MEMBER(ddenlovr_state::ultrchmp_protection2_w)
 {
 //  COMBINE_DATA(m_protection2);
-	m_oki->set_bank_base((data & 0xf) * 0x40000);
+	m_oki->set_rom_bank(data & 0xf);
 }
 
 static ADDRESS_MAP_START( ultrchmp_map, AS_PROGRAM, 16, ddenlovr_state )
@@ -2791,7 +2791,7 @@ WRITE8_MEMBER(ddenlovr_state::hanakanz_palette_w)
 
 WRITE8_MEMBER(ddenlovr_state::hanakanz_oki_bank_w )
 {
-	m_oki->set_bank_base((data & 0x40) ? 0x40000 : 0);
+	m_oki->set_rom_bank((data >> 6) & 1);
 }
 
 READ8_MEMBER(ddenlovr_state::hanakanz_rand_r)
@@ -3018,7 +3018,7 @@ WRITE8_MEMBER(ddenlovr_state::mjchuuka_coincounter_w)
 WRITE8_MEMBER(ddenlovr_state::mjchuuka_oki_bank_w )
 {
 	// data & 0x08 ?
-	m_oki->set_bank_base((data & 0x01) ? 0x40000 : 0);
+	m_oki->set_rom_bank(data & 1);
 
 #ifdef MAME_DEBUG
 //    popmessage("1e = %02x",data);
@@ -3714,9 +3714,7 @@ WRITE16_MEMBER(ddenlovr_state::akamaru_protection1_w)
 	COMBINE_DATA(&m_prot_16);
 	// BCD number?
 	bank = (((m_prot_16 >> 4) & 0x0f) % 10) * 10 + ((m_prot_16 & 0x0f) % 10);
-	if (bank >= 12)
-		bank = 0;
-	m_oki->set_bank_base(bank * 0x40000);
+	m_oki->set_rom_bank(bank);
 
 //  popmessage("bank $%0x (%d)", m_prot_16, bank);
 }
@@ -3803,7 +3801,7 @@ WRITE8_MEMBER(ddenlovr_state::mjflove_rombank_w)
 
 WRITE8_MEMBER(ddenlovr_state::mjflove_okibank_w )
 {
-	m_oki->set_bank_base((data & 0x07) * 0x40000);
+	m_oki->set_rom_bank(data & 0x07);
 	//popmessage("SOUND = %02x", data);
 }
 
@@ -3886,7 +3884,7 @@ ADDRESS_MAP_END
 
 WRITE8_MEMBER(ddenlovr_state::jongtei_okibank_w )
 {
-	m_oki->set_bank_base(((data >> 4) & 0x07) * 0x40000);
+	m_oki->set_rom_bank((data >> 4) & 0x07);
 }
 
 WRITE8_MEMBER(ddenlovr_state::jongtei_dsw_keyb_w)
@@ -4501,7 +4499,7 @@ READ8_MEMBER(ddenlovr_state::momotaro_protection_r)
 
 WRITE8_MEMBER(ddenlovr_state::daimyojn_okibank_w )
 {
-	m_oki->set_bank_base(((data >> 4) & 0x01) * 0x40000);
+	m_oki->set_rom_bank((data >> 4) & 0x01);
 }
 
 WRITE8_MEMBER(ddenlovr_state::daimyojn_palette_sel_w)

src/mame/drivers/ddragon3.cpp

@@ -197,7 +197,7 @@ ROMs (All ROMs are 27C010 EPROM. - means not populated)
 
 WRITE8_MEMBER(ddragon3_state::oki_bankswitch_w)
 {
-	m_oki->set_bank_base((data & 1) * 0x40000);
+	m_oki->set_rom_bank(data & 1);
 }
 
 WRITE16_MEMBER(wwfwfest_state::wwfwfest_soundwrite)

src/mame/drivers/deco156.cpp

@@ -104,14 +104,14 @@ WRITE32_MEMBER(deco156_state::hvysmsh_eeprom_w)
 {
 	if (ACCESSING_BITS_0_7)
 	{
-		m_oki2->set_bank_base(0x40000 * (data & 0x7));
+		m_oki2->set_rom_bank(data & 0x7);
 		ioport("EEPROMOUT")->write(data, 0xff);
 	}
 }
 
 WRITE32_MEMBER(deco156_state::hvysmsh_oki_0_bank_w)
 {
-	m_oki1->set_bank_base((data & 1) * 0x40000);
+	m_oki1->set_rom_bank(data & 1);
 }
 
 WRITE32_MEMBER(deco156_state::wcvol95_nonbuffered_palette_w)

src/mame/drivers/deco32.cpp

@@ -1759,8 +1759,8 @@ WRITE_LINE_MEMBER(deco32_state::sound_irq_nslasher)
 
 WRITE8_MEMBER(deco32_state::sound_bankswitch_w)
 {
-	m_oki1->set_bank_base(((data >> 0)& 1) * 0x40000);
-	m_oki2->set_bank_base(((data >> 1)& 1) * 0x40000);
+	m_oki1->set_rom_bank((data >> 0) & 1);
+	m_oki2->set_rom_bank((data >> 1) & 1);
 }
 
 /**********************************************************************************/

src/mame/drivers/deniam.cpp

@@ -62,7 +62,7 @@ WRITE16_MEMBER(deniam_state::sound_command_w)
 
 WRITE8_MEMBER(deniam_state::deniam16b_oki_rom_bank_w)
 {
-	m_oki->set_bank_base((data & 0x40) ? 0x40000 : 0x00000);
+	m_oki->set_rom_bank((data >> 6) & 1);
 }
 
 WRITE16_MEMBER(deniam_state::deniam16c_oki_rom_bank_w)
@@ -70,7 +70,7 @@ WRITE16_MEMBER(deniam_state::deniam16c_oki_rom_bank_w)
 	if (ACCESSING_BITS_0_7)
 	{
 		if ((data&0xFE) != 0) popmessage("OKI bank was not 0 or 1! contact MAMEDEV!");
-		m_oki->set_bank_base((data & 0x01) ? 0x40000 : 0x00000);
+		m_oki->set_rom_bank(data & 0x01);
 	}
 }
 
@@ -249,7 +249,7 @@ void deniam_state::machine_reset()
 	doesn't matter since the coinup sfx (sample borrowed from 'tyrian' on PC)
 	exists in both banks; it properly sets the bank as soon as the ufo sfx
 	plays or a player character is selected on the character select screen */
-	m_oki->set_bank_base(0x00000);
+	m_oki->set_rom_bank(0);
 }
 
 static MACHINE_CONFIG_START( deniam16b, deniam_state )

src/mame/drivers/diverboy.cpp

@@ -151,7 +151,7 @@ WRITE8_MEMBER(diverboy_state::okibank_w)
 {
 	/* bit 2 might be reset */
 //  popmessage("%02x",data);
-	m_oki->set_bank_base((data & 3) * 0x40000);
+	m_oki->set_rom_bank(data & 3);
 }
 
 

src/mame/drivers/drgnmst.cpp

@@ -149,14 +149,14 @@ WRITE8_MEMBER(drgnmst_state::drgnmst_snd_control_w)
 		m_oki0_bank = oki_new_bank;
 		if (m_oki0_bank)
 			oki_new_bank--;
-		m_oki_1->set_bank_base(oki_new_bank * 0x40000);
+		m_oki_1->set_rom_bank(oki_new_bank);
 	}
 
 	oki_new_bank = ((m_pic16c5x_port0 & 0x3) >> 0) | ((m_oki_control & 0x20) >> 3);
 	if (oki_new_bank != m_oki1_bank)
 	{
 		m_oki1_bank = oki_new_bank;
-		m_oki_2->set_bank_base(oki_new_bank * 0x40000);
+		m_oki_2->set_rom_bank(oki_new_bank);
 	}
 
 	switch (m_oki_control & 0x1f)

src/mame/drivers/drtomy.cpp

@@ -164,7 +164,7 @@ WRITE16_MEMBER(drtomy_state::drtomy_okibank_w)
 	if (m_oki_bank != (data & 3))
 	{
 		m_oki_bank = data & 3;
-		m_oki->set_bank_base(m_oki_bank * 0x40000);
+		m_oki->set_rom_bank(m_oki_bank);
 	}
 
 	/* unknown bit 2 -> (data & 4) */

src/mame/drivers/dynax.cpp

@@ -1556,7 +1556,7 @@ WRITE8_MEMBER(dynax_state::cdracula_sound_rombank_w)
 
 	int num_banks = memregion("oki")->bytes() / 0x40000;
 	if (data < num_banks)
-		m_oki->set_bank_base(data * 0x40000);
+		m_oki->set_rom_bank(data);
 	else
 		logerror("%s: warning, invalid sound bank = %02x\n", machine().describe_context(), data);
 }

src/mame/drivers/egghunt.cpp

@@ -229,7 +229,7 @@ READ8_MEMBER(egghunt_state::egghunt_okibanking_r)
 WRITE8_MEMBER(egghunt_state::egghunt_okibanking_w)
 {
 	m_okibanking = data;
-	m_oki->set_bank_base((data & 0x10) ? 0x40000 : 0);
+	m_oki->set_rom_bank((data >> 4) & 1);
 }
 
 static ADDRESS_MAP_START( egghunt_map, AS_PROGRAM, 8, egghunt_state )

src/mame/drivers/feversoc.cpp

@@ -163,7 +163,7 @@ WRITE32_MEMBER(feversoc_state::output_w)
 		//data>>16 & 2 coin out
 		machine().bookkeeping().coin_counter_w(1,data>>16 & 4);
 		//data>>16 & 8 coin hopper
-		m_oki->set_bank_base(0x40000 * (((data>>16) & 0x20)>>5));
+		m_oki->set_rom_bank(((data>>16) & 0x20)>>5);
 
 		m_eeprom->di_write((data & 0x80000000) ? 1 : 0);
 		m_eeprom->clk_write((data & 0x40000000) ? ASSERT_LINE : CLEAR_LINE);

src/mame/drivers/funybubl.cpp

@@ -74,7 +74,7 @@ WRITE8_MEMBER(funybubl_state::funybubl_soundcommand_w)
 
 WRITE8_MEMBER(funybubl_state::funybubl_oki_bank_sw)
 {
-	m_oki->set_bank_base(((data & 1) * 0x40000));
+	m_oki->set_rom_bank(data & 1);
 }
 
 

src/mame/drivers/fuukifg2.cpp

@@ -126,7 +126,7 @@ WRITE8_MEMBER(fuuki16_state::oki_banking_w)
 	    data & 0x10 is always set
 	*/
 
-	m_oki->set_bank_base(((data & 6) >> 1) * 0x40000);
+	m_oki->set_rom_bank((data & 6) >> 1);
 }
 
 static ADDRESS_MAP_START( fuuki16_sound_map, AS_PROGRAM, 8, fuuki16_state )

src/mame/drivers/galpani2.cpp

@@ -338,7 +338,7 @@ WRITE8_MEMBER(galpani2_state::galpani2_oki1_bank_w)
 
 WRITE8_MEMBER(galpani2_state::galpani2_oki2_bank_w)
 {
-	m_oki2->set_bank_base(0x40000 * (data & 0xf) );
+	m_oki2->set_rom_bank(data & 0xf);
 	logerror("%s : %s bank %08X\n",machine().describe_context(),tag(),data);
 }
 

src/mame/drivers/gcpinbal.cpp

@@ -177,7 +177,7 @@ WRITE16_MEMBER(gcpinbal_state::ioc_w)
 		// MSM6585 bank, coin LEDs, maybe others?
 		case 0x44:
 			m_msm_bank = data & 0x1000 ? 0x100000 : 0;
-			m_oki->set_bank_base(0x40000 * ((data & 0x800 )>> 11));
+			m_oki->set_rom_bank((data & 0x800) >> 11);
 			break;
 
 		case 0x45:

src/mame/drivers/ggconnie.cpp

@@ -58,7 +58,7 @@ WRITE8_MEMBER(ggconnie_state::output_w)
 /* TODO: banking not understood (is the ROM dumped correctly btw?) */
 WRITE8_MEMBER(ggconnie_state::oki_bank_w)
 {
-	m_oki->set_bank_base((data) ? 0x40000 : 0x00000);
+	m_oki->set_rom_bank(data != 0);
 }
 
 

src/mame/drivers/gotcha.cpp

@@ -91,7 +91,7 @@ WRITE16_MEMBER(gotcha_state::gotcha_oki_bank_w)
 {
 	if (ACCESSING_BITS_8_15)
 	{
-		m_oki->set_bank_base((((~data & 0x0100) >> 8) * 0x40000));
+		m_oki->set_rom_bank((~data & 0x0100) >> 8);
 	}
 }
 

src/mame/drivers/gstream.cpp

@@ -351,8 +351,8 @@ WRITE32_MEMBER(gstream_state::gstream_oki_banking_w)
 
 	//popmessage("oki bank = %X\noki_1 = %X\noki_2 = %X\n",data, m_oki_bank_1, m_oki_bank_2);
 
-	m_oki_1->set_bank_base(m_oki_bank_1 * 0x40000);
-	m_oki_2->set_bank_base(m_oki_bank_2 * 0x40000);
+	m_oki_1->set_rom_bank(m_oki_bank_1);
+	m_oki_2->set_rom_bank(m_oki_bank_2);
 }
 
 // Some clocking?

src/mame/drivers/gunpey.cpp

@@ -1270,7 +1270,7 @@ WRITE8_MEMBER(gunpey_state::gunpey_output_w)
 	//bit 0 is coin counter
 //  popmessage("%02x",data);
 
-	m_oki->set_bank_base(((data & 0x70)>>4) * 0x40000);
+	m_oki->set_rom_bank((data & 0x70) >> 4);
 }
 
 WRITE16_MEMBER(gunpey_state::gunpey_vram_bank_w)

src/mame/drivers/igs011.cpp

@@ -1574,7 +1574,7 @@ WRITE16_MEMBER(igs011_state::lhb2_igs003_w)
 			{
 				m_lhb2_pen_hi = data & 0x07;
 
-				m_oki->set_bank_base((data & 0x08) ? 0x40000 : 0);
+				m_oki->set_rom_bank((data >> 3) & 1);
 			}
 
 			if ( m_lhb2_pen_hi & ~0xf )
@@ -1708,7 +1708,7 @@ WRITE16_MEMBER(igs011_state::wlcc_igs003_w)
 				machine().bookkeeping().coin_counter_w(0,    data & 0x01);
 				//  coin out        data & 0x02
 
-				m_oki->set_bank_base((data & 0x10) ? 0x40000 : 0);
+				m_oki->set_rom_bank((data >> 4) & 1);
 				m_igs_hopper        =   data & 0x20;
 			}
 
@@ -2442,7 +2442,7 @@ WRITE16_MEMBER(igs011_state::lhb_okibank_w)
 {
 	if (ACCESSING_BITS_8_15)
 	{
-		m_oki->set_bank_base((data & 0x200) ? 0x40000 : 0);
+		m_oki->set_rom_bank((data >> 9) & 1);
 	}
 
 	if ( data & (~0x200) )

src/mame/drivers/igs017.cpp

@@ -1176,7 +1176,7 @@ void igs017_state::mgcs_igs029_run()
 		switch (port)
 		{
 			case 0x01:
-				m_oki->set_bank_base((data & 0x10) ? 0x40000 : 0);
+				m_oki->set_rom_bank((data >> 4) & 1);
 				machine().bookkeeping().coin_counter_w(0, (~data) & 0x20);   // coin in
 				machine().bookkeeping().coin_counter_w(1, (~data) & 0x40);   // coin out
 
@@ -1465,7 +1465,7 @@ WRITE16_MEMBER(igs017_state::sdmg2_magic_w)
 		case 0x02:
 			if (ACCESSING_BITS_0_7)
 			{
-				m_oki->set_bank_base((data & 0x80) ? 0x40000 : 0);
+				m_oki->set_rom_bank((data >> 7) & 1);
 			}
 			break;
 
@@ -1561,7 +1561,7 @@ WRITE16_MEMBER(igs017_state::mgdha_magic_w)
 			if (ACCESSING_BITS_0_7)
 			{
 				// bit 7?
-				m_oki->set_bank_base((data & 0x40) ? 0x40000 : 0);
+				m_oki->set_rom_bank((data >> 6) & 1);
 			}
 			break;
 
@@ -1640,7 +1640,7 @@ WRITE8_MEMBER(igs017_state::tjsb_output_w)
 			break;
 
 		case 0x02:
-			m_oki->set_bank_base((data & 0x10) ? 0x40000 : 0);   // oki bank (0x20/0x30)
+			m_oki->set_rom_bank((data >> 4) & 1);   // oki bank (0x20/0x30)
 			if (!(data & ~0x30))
 				return;
 			break;
@@ -1765,7 +1765,7 @@ WRITE16_MEMBER(igs017_state::lhzb2_magic_w)
 		case 0x01:
 			if (ACCESSING_BITS_0_7)
 			{
-				m_oki->set_bank_base((data & 0x80) ? 0x40000 : 0);
+				m_oki->set_rom_bank((data >> 7) & 1);
 
 				if ( data & 0x7f )
 					logerror("%s: warning, unknown bits written in oki bank = %04x\n", machine().describe_context(), data);
@@ -2106,7 +2106,7 @@ WRITE16_MEMBER(igs017_state::lhzb2a_input_select_w)
 	}
 	if (ACCESSING_BITS_8_15)
 	{
-		m_oki->set_bank_base((data & 0x0100) ? 0x40000 : 0);
+		m_oki->set_rom_bank((data >> 8) & 1);
 
 		if ( data & 0x0fe00 )
 			logerror("%s: warning, unknown bits written in input_select = %04x\n", machine().describe_context(), data);
@@ -2147,7 +2147,7 @@ WRITE16_MEMBER(igs017_state::slqz2_magic_w)
 		case 0x00:
 			if (ACCESSING_BITS_0_7)
 			{
-				m_oki->set_bank_base((data & 0x01) ? 0x40000 : 0);
+				m_oki->set_rom_bank(data & 0x01);
 
 //              m_hopper            =           data & 0x20;    // hopper motor
 //              machine().bookkeeping().coin_counter_w(1,    data & 0x40);   // coin out counter

src/mame/drivers/joystand.cpp

@@ -363,7 +363,7 @@ READ16_MEMBER(joystand_state::fpga_r)
 WRITE16_MEMBER(joystand_state::oki_bank_w)
 {
 	if (ACCESSING_BITS_0_7)
-		m_oki->set_bank_base(((data >> 6) & 3) * 0x40000);
+		m_oki->set_rom_bank((data >> 6) & 3);
 }
 
 READ16_MEMBER(joystand_state::eeprom_r)

src/mame/drivers/kaneko16.cpp

@@ -338,7 +338,7 @@ ADDRESS_MAP_END
 WRITE16_MEMBER(kaneko16_state::bakubrkr_oki_bank_w)
 {
 	if (ACCESSING_BITS_0_7) {
-		m_oki->set_bank_base(0x40000 * (data & 0x7) );
+		m_oki->set_rom_bank(data & 0x7);
 		logerror("%s:Selecting OKI bank %02X\n",machine().describe_context(),data&0xff);
 	}
 }
@@ -400,7 +400,7 @@ WRITE16_MEMBER(kaneko16_gtmr_state::bloodwar_oki_0_bank_w)
 {
 	if (ACCESSING_BITS_0_7)
 	{
-		m_oki1->set_bank_base(0x40000 * (data & 0xf) );
+		m_oki1->set_rom_bank(data & 0xf);
 //      logerror("CPU #0 PC %06X : OKI0  bank %08X\n",space.device().safe_pc(),data);
 	}
 }
@@ -409,7 +409,7 @@ WRITE16_MEMBER(kaneko16_gtmr_state::bloodwar_oki_1_bank_w)
 {
 	if (ACCESSING_BITS_0_7)
 	{
-		m_oki2->set_bank_base(0x40000 * data );
+		m_oki2->set_rom_bank(data);
 //      logerror("CPU #0 PC %06X : OKI1  bank %08X\n",space.device().safe_pc(),data);
 	}
 }
@@ -464,7 +464,7 @@ WRITE16_MEMBER(kaneko16_gtmr_state::bonkadv_oki_0_bank_w)
 {
 	if (ACCESSING_BITS_0_7)
 	{
-		m_oki1->set_bank_base(0x40000 * (data & 0xF));
+		m_oki1->set_rom_bank(data & 0xf);
 		logerror("%s: OKI0  bank %08X\n",machine().describe_context(),data);
 	}
 }
@@ -473,7 +473,7 @@ WRITE16_MEMBER(kaneko16_gtmr_state::bonkadv_oki_1_bank_w)
 {
 	if (ACCESSING_BITS_0_7)
 	{
-		m_oki2->set_bank_base(0x40000 * data );
+		m_oki2->set_rom_bank(data);
 		logerror("%s: OKI1  bank %08X\n",machine().describe_context(),data);
 	}
 }
@@ -533,7 +533,7 @@ WRITE16_MEMBER(kaneko16_gtmr_state::gtmr_oki_0_bank_w)
 {
 	if (ACCESSING_BITS_0_7)
 	{
-		m_oki1->set_bank_base( 0x40000 * (data & 0xF) );
+		m_oki1->set_rom_bank(data & 0xf);
 //      logerror("CPU #0 PC %06X : OKI0 bank %08X\n",space.device().safe_pc(),data);
 	}
 }
@@ -542,7 +542,7 @@ WRITE16_MEMBER(kaneko16_gtmr_state::gtmr_oki_1_bank_w)
 {
 	if (ACCESSING_BITS_0_7)
 	{
-		m_oki2->set_bank_base( 0x40000 * (data & 0x1) );
+		m_oki2->set_rom_bank(data & 0x1);
 //      logerror("CPU #0 PC %06X : OKI1 bank %08X\n",space.device().safe_pc(),data);
 	}
 }
@@ -778,7 +778,7 @@ ADDRESS_MAP_END
 WRITE8_MEMBER(kaneko16_state::wingforc_oki_bank_w)
 {
 	if (data <= 2)
-		m_oki->set_bank_base(0x40000 * data);
+		m_oki->set_rom_bank(data);
 	else
 		logerror("%s: unknown OKI bank %02X\n", machine().describe_context(), data);
 }

src/mame/drivers/kickgoal.cpp

@@ -213,10 +213,10 @@ WRITE16_MEMBER(kickgoal_state::actionhw_snd_w)
 
 	switch (data)
 	{
-		case 0xfc:  m_oki->set_bank_base((0 * 0x40000)); break;
-		case 0xfd:  m_oki->set_bank_base((2 * 0x40000)); break;
-		case 0xfe:  m_oki->set_bank_base((1 * 0x40000)); break;
-		case 0xff:  m_oki->set_bank_base((3 * 0x40000)); break;
+		case 0xfc:  m_oki->set_rom_bank(0); break;
+		case 0xfd:  m_oki->set_rom_bank(2); break;
+		case 0xfe:  m_oki->set_rom_bank(1); break;
+		case 0xff:  m_oki->set_rom_bank(3); break;
 		case 0x78:
 				m_oki->write_command(data);
 				m_snd_sam[0] = 00; m_snd_sam[1]= 00; m_snd_sam[2] = 00; m_snd_sam[3] = 00;
@@ -335,7 +335,7 @@ INTERRUPT_GEN_MEMBER(kickgoal_state::kickgoal_interrupt)
 			if (m_m6295_bank == 0x03)
 				m_m6295_bank = 0x00;
 			popmessage("Changing Bank to %02x", m_m6295_bank);
-			m_adpcm->set_bank_base(((m_m6295_bank) * 0x40000));
+			m_adpcm->set_rom_bank(m_m6295_bank);
 
 			if (m_m6295_key_delay == 0xffff)
 				m_m6295_key_delay = 0x00;
@@ -354,7 +354,7 @@ INTERRUPT_GEN_MEMBER(kickgoal_state::kickgoal_interrupt)
 			if (m_m6295_bank == 0x03)
 				m_m6295_bank = 0x02;
 			popmessage("Changing Bank to %02x", m_m6295_bank);
-			m_adpcm->set_bank_base(((m_m6295_bank) * 0x40000));
+			m_adpcm->set_rom_bank(m_m6295_bank);
 
 			if (m_m6295_key_delay == 0xffff)
 				m_m6295_key_delay = 0x00;
@@ -370,11 +370,11 @@ INTERRUPT_GEN_MEMBER(kickgoal_state::kickgoal_interrupt)
 		{
 			m_m6295_comm += 1;
 			m_m6295_comm &= 0x7f;
-			if (m_m6295_comm == 0x00) { m_adpcm->set_bank_base((0 * 0x40000)); m_m6295_bank = 0; }
-			if (m_m6295_comm == 0x60) { m_adpcm->set_bank_base((0 * 0x40000)); m_m6295_bank = 0; }
-			if (m_m6295_comm == 0x65) { m_adpcm->set_bank_base((1 * 0x40000)); m_m6295_bank = 1; }
-			if (m_m6295_comm == 0x69) { m_adpcm->set_bank_base((2 * 0x40000)); m_m6295_bank = 2; }
-			if (m_m6295_comm == 0x70) { m_adpcm->set_bank_base((1 * 0x40000)); m_m6295_bank = 1; }
+			if (m_m6295_comm == 0x00) { m_adpcm->set_rom_bank(0); m_m6295_bank = 0; }
+			if (m_m6295_comm == 0x60) { m_adpcm->set_rom_bank(0); m_m6295_bank = 0; }
+			if (m_m6295_comm == 0x65) { m_adpcm->set_rom_bank(1); m_m6295_bank = 1; }
+			if (m_m6295_comm == 0x69) { m_adpcm->set_rom_bank(2); m_m6295_bank = 2; }
+			if (m_m6295_comm == 0x70) { m_adpcm->set_rom_bank(1); m_m6295_bank = 1; }
 			popmessage("Sound test command %02x on Bank %02x", m_m6295_comm, m_m6295_bank);
 
 			if (m_m6295_key_delay == 0xffff)
@@ -391,11 +391,11 @@ INTERRUPT_GEN_MEMBER(kickgoal_state::kickgoal_interrupt)
 		{
 			m_m6295_comm -= 1;
 			m_m6295_comm &= 0x7f;
-			if (m_m6295_comm == 0x2b) { m_adpcm->set_bank_base((0 * 0x40000)); m_m6295_bank = 0; }
-			if (m_m6295_comm == 0x64) { m_adpcm->set_bank_base((0 * 0x40000)); m_m6295_bank = 0; }
-			if (m_m6295_comm == 0x68) { m_adpcm->set_bank_base((1 * 0x40000)); m_m6295_bank = 1; }
-			if (m_m6295_comm == 0x6c) { m_adpcm->set_bank_base((2 * 0x40000)); m_m6295_bank = 2; }
-			if (m_m6295_comm == 0x76) { m_adpcm->set_bank_base((1 * 0x40000)); m_m6295_bank = 1; }
+			if (m_m6295_comm == 0x2b) { m_adpcm->set_rom_bank(0); m_m6295_bank = 0; }
+			if (m_m6295_comm == 0x64) { m_adpcm->set_rom_bank(0); m_m6295_bank = 0; }
+			if (m_m6295_comm == 0x68) { m_adpcm->set_rom_bank(1); m_m6295_bank = 1; }
+			if (m_m6295_comm == 0x6c) { m_adpcm->set_rom_bank(2); m_m6295_bank = 2; }
+			if (m_m6295_comm == 0x76) { m_adpcm->set_rom_bank(1); m_m6295_bank = 1; }
 			popmessage("Sound test command %02x on Bank %02x", m_m6295_comm, m_m6295_bank);
 
 			if (m_m6295_key_delay == 0xffff)

src/mame/drivers/lordgun.cpp

@@ -352,7 +352,7 @@ ADDRESS_MAP_END
 
 WRITE8_MEMBER(lordgun_state::lordgun_okibank_w)
 {
-	m_oki->set_bank_base((data & 2) ? 0x40000 : 0);
+	m_oki->set_rom_bank((data >> 1) & 1);
 	if (data & ~3)  logerror("%s: unknown okibank bits %02x\n", machine().describe_context(), data);
 //  popmessage("OKI %x", data);
 }

src/mame/drivers/m92.cpp

@@ -418,7 +418,7 @@ ADDRESS_MAP_END
 
 WRITE16_MEMBER(m92_state::oki_bank_w)
 {
-	m_oki->set_bank_base(0x40000 * ((data+1) & 0x3)); // +1?
+	m_oki->set_rom_bank((data+1) & 0x3); // +1?
 }
 
 static ADDRESS_MAP_START( ppan_portmap, AS_IO, 16, m92_state )

src/mame/drivers/metro.cpp

@@ -1171,7 +1171,7 @@ ADDRESS_MAP_END
 void metro_state::gakusai_oki_bank_set()
 {
 	int bank = (m_gakusai_oki_bank_lo & 7) + (m_gakusai_oki_bank_hi & 1) * 8;
-	m_oki->set_bank_base(bank * 0x40000);
+	m_oki->set_rom_bank(bank);
 }
 
 WRITE16_MEMBER(metro_state::gakusai_oki_bank_hi_w)

src/mame/drivers/midyunit.cpp

@@ -139,7 +139,7 @@ Notes:
 WRITE8_MEMBER(midyunit_state::yawdim_oki_bank_w)
 {
 	if (data & 4)
-		m_oki->set_bank_base(0x40000 * (data & 3));
+		m_oki->set_rom_bank(data & 3);
 }
 
 

src/mame/drivers/mirage.cpp

@@ -133,13 +133,13 @@ READ16_MEMBER(miragemi_state::mirage_input_r)
 
 WRITE16_MEMBER(miragemi_state::okim1_rombank_w)
 {
-	m_oki_sfx->set_bank_base(0x40000 * (data & 0x3));
+	m_oki_sfx->set_rom_bank(data & 0x3);
 }
 
 WRITE16_MEMBER(miragemi_state::okim0_rombank_w)
 {
 	/*bits 4-6 used on POST? */
-	m_oki_bgm->set_bank_base(0x40000 * (data & 0x7));
+	m_oki_bgm->set_rom_bank(data & 0x7);
 }
 
 static ADDRESS_MAP_START( mirage_map, AS_PROGRAM, 16, miragemi_state )

src/mame/drivers/mitchell.cpp

@@ -400,7 +400,7 @@ ADDRESS_MAP_END
 /**** Monsters World ****/
 WRITE8_MEMBER(mitchell_state::oki_banking_w)
 {
-	m_oki->set_bank_base(0x40000 * (data & 3));
+	m_oki->set_rom_bank(data & 3);
 }
 
 static ADDRESS_MAP_START( mstworld_sound_map, AS_PROGRAM, 8, mitchell_state )

src/mame/drivers/moo.cpp

@@ -314,7 +314,7 @@ WRITE16_MEMBER(moo_state::moobl_oki_bank_w)
 {
 	logerror("%x to OKI bank\n", data);
 
-	m_oki->set_bank_base((data & 0x0f) * 0x40000);
+	m_oki->set_rom_bank(data & 0x0f);
 }
 
 static ADDRESS_MAP_START( moo_map, AS_PROGRAM, 16, moo_state )

src/mame/drivers/mwarr.cpp

@@ -145,7 +145,7 @@ WRITE16_MEMBER(mwarr_state::tx_videoram_w)
 
 WRITE16_MEMBER(mwarr_state::oki1_bank_w)
 {
-	m_oki2->set_bank_base(0x40000 * (data & 3));
+	m_oki2->set_rom_bank(data & 3);
 }
 
 WRITE16_MEMBER(mwarr_state::sprites_commands_w)

src/mame/drivers/nmg5.cpp

@@ -345,7 +345,7 @@ WRITE16_MEMBER(nmg5_state::priority_reg_w)
 
 WRITE8_MEMBER(nmg5_state::oki_banking_w)
 {
-	m_oki->set_bank_base((data & 1) ? 0x40000 : 0);
+	m_oki->set_rom_bank(data & 1);
 }
 
 /*******************************************************************

src/mame/drivers/nmk16.cpp

@@ -5025,9 +5025,9 @@ ADDRESS_MAP_END
 WRITE8_MEMBER(nmk16_state::spec2k_oki1_banking_w)
 {
 	if(data == 0xfe)
-		m_oki2->set_bank_base(0);
+		m_oki2->set_rom_bank(0);
 	else if(data == 0xff)
-		m_oki2->set_bank_base(0x40000);
+		m_oki2->set_rom_bank(1);
 }
 
 static ADDRESS_MAP_START( afega_sound_cpu, AS_PROGRAM, 8, nmk16_state )
@@ -5053,7 +5053,7 @@ ADDRESS_MAP_END
 
 WRITE8_MEMBER(nmk16_state::twinactn_oki_bank_w)
 {
-	m_oki1->set_bank_base((data & 3) * 0x40000);
+	m_oki1->set_rom_bank(data & 3);
 
 	if (data & (~3))
 		logerror("%s: invalid oki bank %02x\n", machine().describe_context(), data);

src/mame/drivers/oneshot.cpp

@@ -96,7 +96,7 @@ WRITE16_MEMBER(oneshot_state::soundbank_w)
 {
 	if (ACCESSING_BITS_0_7)
 	{
-		m_oki->set_bank_base(0x40000 * ((data & 0x03) ^ 0x03));
+		m_oki->set_rom_bank((data & 0x03) ^ 0x03);
 	}
 }
 

src/mame/drivers/paradise.cpp

@@ -115,7 +115,7 @@ WRITE8_MEMBER(paradise_state::paradise_okibank_w)
 	if (data & ~0x02)
 		logerror("%s: unknown oki bank bits %02X\n", machine().describe_context(), data);
 
-	m_oki2->set_bank_base((data & 0x02) ? 0x40000 : 0);
+	m_oki2->set_rom_bank((data & 0x02) >> 1);
 }
 
 WRITE8_MEMBER(paradise_state::torus_coin_counter_w)

src/mame/drivers/pasha2.cpp

@@ -201,13 +201,13 @@ WRITE16_MEMBER(pasha2_state::bitmap_1_w)
 WRITE16_MEMBER(pasha2_state::oki1_bank_w)
 {
 	if (offset)
-		m_oki1->set_bank_base((data & 1) * 0x40000);
+		m_oki1->set_rom_bank(data & 1);
 }
 
 WRITE16_MEMBER(pasha2_state::oki2_bank_w)
 {
 	if (offset)
-		m_oki2->set_bank_base((data & 1) * 0x40000);
+		m_oki2->set_rom_bank(data & 1);
 }
 
 WRITE16_MEMBER(pasha2_state::pasha2_lamps_w)

src/mame/drivers/pirates.cpp

@@ -106,7 +106,7 @@ WRITE16_MEMBER(pirates_state::out_w)
 		m_eeprom->clk_write((data & 0x02) ? ASSERT_LINE : CLEAR_LINE);
 
 		/* bit 6 selects oki bank */
-		m_oki->set_bank_base((data & 0x40) ? 0x40000 : 0x00000);
+		m_oki->set_rom_bank((data >> 6) & 1);
 
 		/* bit 7 used (function unknown) */
 	}

src/mame/drivers/pktgaldx.cpp

@@ -65,7 +65,7 @@ bootleg todo:
 
 WRITE16_MEMBER(pktgaldx_state::pktgaldx_oki_bank_w)
 {
-	m_oki2->set_bank_base((data & 3) * 0x40000);
+	m_oki2->set_rom_bank(data & 3);
 }
 
 /**********************************************************************************/

src/mame/drivers/playmark.cpp

@@ -215,7 +215,7 @@ WRITE8_MEMBER(playmark_state::playmark_oki_banking_w)
 
 		if (((m_old_oki_bank - 1) * 0x40000) < memregion("oki")->bytes())
 		{
-			m_oki->set_bank_base(0x40000 * (m_old_oki_bank - 1));
+			m_oki->set_rom_bank(m_old_oki_bank - 1);
 		}
 	}
 }
@@ -260,7 +260,7 @@ WRITE8_MEMBER(playmark_state::hrdtimes_snd_control_w)
 
 		if ((m_old_oki_bank * 0x40000) < memregion("oki")->bytes())
 		{
-			m_oki->set_bank_base(0x40000 * m_old_oki_bank);
+			m_oki->set_rom_bank(m_old_oki_bank);
 		}
 	}
 

src/mame/drivers/powerbal.cpp

@@ -80,10 +80,10 @@ WRITE16_MEMBER(powerbal_state::oki_banking)
 {
 	if (data & 3)
 	{
-		int addr = 0x40000 * ((data & 3) - 1);
+		int addr = (data & 3) - 1;
 
-		if (addr < memregion("oki")->bytes())
-			m_oki->set_bank_base(addr);
+		if (addr * 0x40000 < memregion("oki")->bytes())
+			m_oki->set_rom_bank(addr);
 	}
 }
 

src/mame/drivers/pzletime.cpp

@@ -220,7 +220,7 @@ WRITE16_MEMBER(pzletime_state::video_regs_w)
 
 WRITE16_MEMBER(pzletime_state::oki_bank_w)
 {
-	m_oki->set_bank_base(0x40000 * (data & 0x3));
+	m_oki->set_rom_bank(data & 0x3);
 }
 
 CUSTOM_INPUT_MEMBER(pzletime_state::ticket_status_r)

src/mame/drivers/rohga.cpp

@@ -756,8 +756,8 @@ GFXDECODE_END
 
 WRITE8_MEMBER(rohga_state::sound_bankswitch_w)
 {
-	m_oki1->set_bank_base(BIT(data, 0) * 0x40000);
-	m_oki2->set_bank_base(BIT(data, 1) * 0x40000);
+	m_oki1->set_rom_bank(BIT(data, 0));
+	m_oki2->set_rom_bank(BIT(data, 1));
 }
 
 /**********************************************************************************/

src/mame/drivers/seibuspi.cpp

@@ -915,7 +915,7 @@ WRITE8_MEMBER(seibuspi_state::spi_layerbanks_eeprom_w)
 
 WRITE8_MEMBER(seibuspi_state::oki_bank_w)
 {
-	m_oki2->set_bank_base((data & 0x04) ? 0x40000 : 0);
+	m_oki2->set_rom_bank((data >> 2) & 1);
 }
 
 WRITE8_MEMBER(seibuspi_state::z80_prg_transfer_w)

src/mame/drivers/seicupbl.cpp

@@ -347,7 +347,7 @@ ADDRESS_MAP_END
 WRITE8_MEMBER(seicupbl_state::okim_rombank_w)
 {
 //  popmessage("%08x",0x40000 * (data & 0x07));
-	m_oki->set_bank_base(0x40000 * (data & 0x7));
+	m_oki->set_rom_bank(data & 0x7);
 }
 
 static ADDRESS_MAP_START( cupsocbl_sound_mem, AS_PROGRAM, 8, seicupbl_state )

src/mame/drivers/shadfrce.cpp

@@ -388,7 +388,7 @@ ADDRESS_MAP_END
 
 WRITE8_MEMBER(shadfrce_state::oki_bankswitch_w)
 {
-	m_oki->set_bank_base((data & 1) * 0x40000);
+	m_oki->set_rom_bank(data & 1);
 }
 
 static ADDRESS_MAP_START( shadfrce_sound_map, AS_PROGRAM, 8, shadfrce_state )

src/mame/drivers/shangha3.cpp

@@ -84,7 +84,7 @@ WRITE16_MEMBER(shangha3_state::heberpop_coinctrl_w)
 	if (ACCESSING_BITS_0_7)
 	{
 		/* the sound ROM bank is selected by the main CPU! */
-		m_oki->set_bank_base((data & 0x08) ? 0x40000 : 0x00000);
+		m_oki->set_rom_bank((data >> 3) & 1);
 
 		machine().bookkeeping().coin_lockout_w(0,~data & 0x04);
 		machine().bookkeeping().coin_lockout_w(1,~data & 0x04);
@@ -98,7 +98,7 @@ WRITE16_MEMBER(shangha3_state::blocken_coinctrl_w)
 	if (ACCESSING_BITS_0_7)
 	{
 		/* the sound ROM bank is selected by the main CPU! */
-		m_oki->set_bank_base(((data >> 4) & 3) * 0x40000);
+		m_oki->set_rom_bank((data >> 4) & 3);
 
 		machine().bookkeeping().coin_lockout_w(0,~data & 0x04);
 		machine().bookkeeping().coin_lockout_w(1,~data & 0x04);

src/mame/drivers/silkroad.cpp

@@ -141,7 +141,7 @@ WRITE32_MEMBER(silkroad_state::silk_6295_bank_w)
 	{
 		int bank = (data & 0x3000000) >> 24;
 		if(bank < 3)
-			m_oki1->set_bank_base(0x40000 * (bank));
+			m_oki1->set_rom_bank(bank);
 	}
 }
 

src/mame/drivers/simpl156.cpp

@@ -135,7 +135,7 @@ WRITE32_MEMBER(simpl156_state::simpl156_eeprom_w)
 
 	//okibank = data & 0x07;
 
-	m_okimusic->set_bank_base(0x40000 * (data & 0x7));
+	m_okimusic->set_rom_bank(data & 0x7);
 
 	m_eeprom->clk_write(BIT(data, 5) ? ASSERT_LINE : CLEAR_LINE);
 	m_eeprom->di_write(BIT(data, 4));

src/mame/drivers/snowbros.cpp

@@ -367,7 +367,7 @@ WRITE8_MEMBER(snowbros_state::twinadv_oki_bank_w)
 
 	if (data&0xfd) logerror ("Unused bank bits! %02x\n",data);
 
-	m_oki->set_bank_base(bank * 0x40000);
+	m_oki->set_rom_bank(bank);
 }
 
 static ADDRESS_MAP_START( twinadv_sound_io_map, AS_IO, 8, snowbros_state )

src/mame/drivers/sslam.cpp

@@ -317,13 +317,13 @@ WRITE8_MEMBER(sslam_state::sslam_snd_w)
 		else if (m_sound >= 0x70) {
 			/* These vocals are in bank 1, but a bug in the actual MCU doesn't set the bank */
 //          if (m_snd_bank != 1)
-//          m_oki->set_bank_base((1 * 0x40000));
+//          m_oki->set_rom_bank(1);
 //          sslam_snd_bank = 1;
 			sslam_play(0, m_sound);
 		}
 		else if (m_sound >= 0x69) {
 			if (m_snd_bank != 2)
-				m_oki->set_bank_base(2 * 0x40000);
+				m_oki->set_rom_bank(2);
 			m_snd_bank = 2;
 			switch (m_sound)
 			{
@@ -336,14 +336,14 @@ WRITE8_MEMBER(sslam_state::sslam_snd_w)
 		}
 		else if (m_sound >= 0x65) {
 			if (m_snd_bank != 1)
-				m_oki->set_bank_base(1 * 0x40000);
+				m_oki->set_rom_bank(1);
 			m_snd_bank = 1;
 			m_melody = 4;
 			sslam_play(m_melody, m_sound);
 		}
 		else if (m_sound >= 0x60) {
 			if (m_snd_bank != 0)
-				m_oki->set_bank_base(0 * 0x40000);
+				m_oki->set_rom_bank(0);
 			m_snd_bank = 0;
 			switch (m_sound)
 			{
@@ -446,7 +446,7 @@ WRITE8_MEMBER(sslam_state::playmark_snd_control_w)
 		if (m_oki_bank != ((data & 3) - 1))
 		{
 			m_oki_bank = (data & 3) - 1;
-			m_oki->set_bank_base(0x40000 * m_oki_bank);
+			m_oki->set_rom_bank(m_oki_bank);
 		}
 	}
 

src/mame/drivers/stlforce.cpp

@@ -88,7 +88,7 @@ WRITE16_MEMBER(stlforce_state::eeprom_w)
 
 WRITE16_MEMBER(stlforce_state::oki_bank_w)
 {
-	m_oki->set_bank_base(0x40000 * ((data>>8) & 3));
+	m_oki->set_rom_bank((data>>8) & 3);
 }
 
 static ADDRESS_MAP_START( stlforce_map, AS_PROGRAM, 16, stlforce_state )

src/mame/drivers/subsino2.cpp

@@ -841,13 +841,13 @@ READ8_MEMBER(subsino2_state::vblank_bit6_r)
 WRITE8_MEMBER(subsino2_state::oki_bank_bit0_w)
 {
 	// it writes 0x32 or 0x33
-	m_oki->set_bank_base((data & 1) * 0x40000);
+	m_oki->set_rom_bank(data & 1);
 }
 
 WRITE8_MEMBER(subsino2_state::oki_bank_bit4_w)
 {
 	// it writes 0x23 or 0x33
-	m_oki->set_bank_base(((data >> 4) & 1) * 0x40000);
+	m_oki->set_rom_bank((data >> 4) & 1);
 }
 
 INTERRUPT_GEN_MEMBER(subsino2_state::am188em_int0_irq)

src/mame/drivers/taito_f2.cpp

@@ -618,7 +618,7 @@ READ8_MEMBER(taitof2_state::driveout_sound_command_r)
 
 void taitof2_state::reset_driveout_sound_region()
 {
-	m_oki->set_bank_base(m_oki_bank * 0x40000);
+	m_oki->set_rom_bank(m_oki_bank);
 }
 
 WRITE8_MEMBER(taitof2_state::oki_bank_w)

src/mame/drivers/tickee.cpp

@@ -399,19 +399,19 @@ WRITE16_MEMBER(tickee_state::sound_bank_w)
 	switch (data & 0xff)
 	{
 		case 0x2c:
-			m_oki->set_bank_base(0x00000);
+			m_oki->set_rom_bank(0);
 			break;
 
 		case 0x2d:
-			m_oki->set_bank_base(0x40000);
+			m_oki->set_rom_bank(1);
 			break;
 
 		case 0x1c:
-			m_oki->set_bank_base(0x80000);
+			m_oki->set_rom_bank(2);
 			break;
 
 		case 0x1d:
-			m_oki->set_bank_base(0xc0000);
+			m_oki->set_rom_bank(3);
 			break;
 
 		default:

src/mame/drivers/tmaster.cpp

@@ -206,7 +206,7 @@ WRITE_LINE_MEMBER(tmaster_state::write_oki_bank0)
 	else
 		m_okibank &= ~1;
 
-	m_oki->set_bank_base(m_okibank * 0x40000);
+	m_oki->set_rom_bank(m_okibank);
 }
 
 WRITE_LINE_MEMBER(tmaster_state::write_oki_bank1)
@@ -216,7 +216,7 @@ WRITE_LINE_MEMBER(tmaster_state::write_oki_bank1)
 	else
 		m_okibank &= ~2;
 
-	m_oki->set_bank_base(m_okibank * 0x40000);
+	m_oki->set_rom_bank(m_okibank);
 }
 
 /***************************************************************************

src/mame/drivers/toaplan2.cpp

@@ -617,7 +617,7 @@ WRITE16_MEMBER(toaplan2_state::shippumd_coin_word_w)
 	if (ACCESSING_BITS_0_7)
 	{
 		toaplan2_coin_w(space, offset, data & 0xff);
-		m_oki->set_bank_base(((data & 0x10) >> 4) * 0x40000);
+		m_oki->set_rom_bank((data & 0x10) >> 4);
 	}
 	if (ACCESSING_BITS_8_15 && (data & 0xff00) )
 	{
@@ -775,7 +775,7 @@ WRITE16_MEMBER(toaplan2_state::oki_bankswitch_w)
 {
 	if (ACCESSING_BITS_0_7)
 	{
-		m_oki->set_bank_base((data & 1) * 0x40000);
+		m_oki->set_rom_bank(data & 1);
 	}
 }
 
@@ -783,7 +783,7 @@ WRITE16_MEMBER(toaplan2_state::oki1_bankswitch_w)
 {
 	if (ACCESSING_BITS_0_7)
 	{
-		m_oki1->set_bank_base((data & 1) * 0x40000);
+		m_oki1->set_rom_bank(data & 1);
 	}
 }
 

src/mame/drivers/unico.cpp

@@ -49,7 +49,7 @@ WRITE16_MEMBER(unico_state::burglarx_sound_bank_w)
 	if (ACCESSING_BITS_8_15)
 	{
 		int bank = (data >> 8 ) & 1;
-		m_oki->set_bank_base(0x40000 * bank );
+		m_oki->set_rom_bank(bank);
 	}
 }
 

src/mame/drivers/vamphalf.cpp

@@ -293,7 +293,7 @@ F94B
 
 WRITE32_MEMBER(vamphalf_state::finalgdr_oki_bank_w)
 {
-	m_oki->set_bank_base(0x40000 * ((data & 0x300) >> 8));
+	m_oki->set_rom_bank((data & 0x300) >> 8);
 }
 
 WRITE32_MEMBER(vamphalf_state::finalgdr_backupram_bank_w)
@@ -331,19 +331,19 @@ WRITE32_MEMBER(vamphalf_state::finalgdr_prize_w)
 
 WRITE32_MEMBER(vamphalf_state::aoh_oki_bank_w)
 {
-	m_oki2->set_bank_base(0x40000 * (data & 0x3));
+	m_oki2->set_rom_bank(data & 0x3);
 }
 
 WRITE16_MEMBER(vamphalf_state::boonggab_oki_bank_w)
 {
 	if(offset)
-		m_oki->set_bank_base(0x40000 * (data & 0x7));
+		m_oki->set_rom_bank(data & 0x7);
 }
 
 
 WRITE16_MEMBER(vamphalf_state::mrkicker_oki_bank_w)
 {
-	m_oki->set_bank_base(0x40000 * (data & 0x3));
+	m_oki->set_rom_bank(data & 0x3);
 }
 
 WRITE16_MEMBER(vamphalf_state::boonggab_prize_w)

src/mame/video/mitchell.cpp

@@ -158,7 +158,7 @@ logerror("PC %04x: pang_gfxctrl_w %02x\n",space.device().safe_pc(),data);
 
 	/* bit 4 selects OKI M6295 bank */
 	if (m_oki != nullptr)
-		m_oki->set_bank_base((data & 0x10) ? 0x40000 : 0x00000);
+		m_oki->set_rom_bank((data >> 4) & 1);
 
 	/* bit 5 is palette RAM bank selector (doesn't apply to mgakuen) */
 	m_paletteram_bank = data & 0x20;