diff --git a/src/mame/drivers/xavix.cpp b/src/mame/drivers/xavix.cpp
index 0859b38667a..a32d2038607 100644
--- a/src/mame/drivers/xavix.cpp
+++ b/src/mame/drivers/xavix.cpp
@@ -1152,14 +1152,23 @@ void xavix_state::xavix2002(machine_config &config)
 
 	m_palette->set_entries(512);
 
-	XAVIX2002IO(config, "xavix2002io", 0);
+	XAVIX2002IO(config, m_xavix2002io, 0);
 }
 
+
+
 void xavix_i2c_jmat_state::xavix2002_i2c_jmat(machine_config &config)
 {
 	xavix2002(config);
 
 	I2CMEM(config, "i2cmem", 0)/*.set_page_size(16)*/.set_data_size(0x200); // ?
+
+	m_xavix2002io->read_0_callback().set(FUNC(xavix_i2c_jmat_state::read_extended_io0));
+	m_xavix2002io->write_0_callback().set(FUNC(xavix_i2c_jmat_state::write_extended_io0));
+	m_xavix2002io->read_1_callback().set(FUNC(xavix_i2c_jmat_state::read_extended_io1));
+	m_xavix2002io->write_1_callback().set(FUNC(xavix_i2c_jmat_state::write_extended_io1));
+	m_xavix2002io->read_2_callback().set(FUNC(xavix_i2c_jmat_state::read_extended_io2));
+	m_xavix2002io->write_2_callback().set(FUNC(xavix_i2c_jmat_state::write_extended_io2));
 }
 
 
@@ -1687,7 +1696,7 @@ CONS( 2004, xavbox,   0, 0, xavix2002_i2c_24c04, xavix_i2c,  xavix_i2c_state,
 CONS( 2004, xavbassf, 0, 0, xavix2002_i2c_24c04, xavix_i2c,  xavix_i2c_state,      init_xavix, "SSD Company LTD",         "XaviX Bass Fishing (XaviXPORT)", MACHINE_NOT_WORKING | MACHINE_IMPERFECT_GRAPHICS | MACHINE_IMPERFECT_SOUND )
 
 // TODO: check SEEPROM type and hookup, banking!
-CONS( 2005, xavjmat,  0, 0, xavix2002_i2c_jmat,  xavix,      xavix_i2c_jmat_state, init_xavix, "SSD Company LTD",         "Jackie Chan J-Mat Fitness (XaviXPORT)", MACHINE_NOT_WORKING | MACHINE_IMPERFECT_GRAPHICS | MACHINE_IMPERFECT_SOUND )
+CONS( 2005, xavjmat,  0, 0, xavix2002_i2c_jmat,  xavix_i2c,      xavix_i2c_jmat_state, init_xavix, "SSD Company LTD",         "Jackie Chan J-Mat Fitness (XaviXPORT)", MACHINE_NOT_WORKING | MACHINE_IMPERFECT_GRAPHICS | MACHINE_IMPERFECT_SOUND )
 
 // https://arnaudmeyer.wordpress.com/domyos-interactive-system/
 // Domyos Fitness Adventure
diff --git a/src/mame/includes/xavix.h b/src/mame/includes/xavix.h
index 58d5fee1a0f..a2ccd147eac 100644
--- a/src/mame/includes/xavix.h
+++ b/src/mame/includes/xavix.h
@@ -568,11 +568,12 @@ private:
 
 	required_device<xavix_sound_device> m_sound;
 
-	optional_device<xavix2002_io_device> m_xavix2002io;
 
 	DECLARE_READ8_MEMBER(sound_regram_read_cb);
 
 protected:
+	optional_device<xavix2002_io_device> m_xavix2002io;
+
 	// additional SuperXaviX / XaviX2002 stuff
 
 	uint8_t m_sx_extended_extbus[3];
@@ -621,19 +622,22 @@ private:
 	int hackaddress2;
 };
 
-class xavix_i2c_jmat_state : public xavix_state
+class xavix_i2c_jmat_state : public xavix_i2c_state
 {
 public:
 	xavix_i2c_jmat_state(const machine_config &mconfig, device_type type, const char *tag)
-		: xavix_state(mconfig, type, tag),
-		m_i2cmem(*this, "i2cmem")
+		: xavix_i2c_state(mconfig, type, tag)
 	{ }
 
 	void xavix2002_i2c_jmat(machine_config &config);
 
 private:
-
-	required_device<i2cmem_device> m_i2cmem;
+	READ8_MEMBER(read_extended_io0);
+	READ8_MEMBER(read_extended_io1);
+	READ8_MEMBER(read_extended_io2);
+	WRITE8_MEMBER(write_extended_io0);
+	WRITE8_MEMBER(write_extended_io1);
+	WRITE8_MEMBER(write_extended_io2);
 };
 
 
diff --git a/src/mame/machine/xavix.cpp b/src/mame/machine/xavix.cpp
index 55e9653948a..bcf68c280b1 100644
--- a/src/mame/machine/xavix.cpp
+++ b/src/mame/machine/xavix.cpp
@@ -590,15 +590,8 @@ void xavix_i2c_state::write_io1(uint8_t data, uint8_t direction)
 // for taikodp
 void xavix_i2c_cart_state::write_io1(uint8_t data, uint8_t direction)
 {
-	if (direction & 0x08)
-	{
-		m_i2cmem->write_sda((data & 0x08) >> 3);
-	}
-
-	if (direction & 0x10)
-	{
-		m_i2cmem->write_scl((data & 0x10) >> 4);
-	}
+	m_i2cmem->write_sda((data & 0x08) >> 3);
+	m_i2cmem->write_scl((data & 0x10) >> 4);
 }
 
 void xavix_ekara_state::write_io0(uint8_t data, uint8_t direction)
@@ -613,6 +606,36 @@ void xavix_ekara_state::write_io1(uint8_t data, uint8_t direction)
 	m_extraiowrite = extraiowrite;
 }
 
+/* SuperXavix IO port handliner (per game) */
+
+READ8_MEMBER(xavix_i2c_jmat_state::read_extended_io0)
+{
+	return 0x00;
+}
+
+READ8_MEMBER(xavix_i2c_jmat_state::read_extended_io1)
+{
+	return 0x00;
+}
+
+READ8_MEMBER(xavix_i2c_jmat_state::read_extended_io2)
+{
+	return 0x00;
+}
+
+WRITE8_MEMBER(xavix_i2c_jmat_state::write_extended_io0)
+{
+}
+
+WRITE8_MEMBER(xavix_i2c_jmat_state::write_extended_io1)
+{
+}
+
+WRITE8_MEMBER(xavix_i2c_jmat_state::write_extended_io2)
+{
+}
+
+
 /* General IO port handling */
 
 READ8_MEMBER(xavix_state::io0_data_r)
diff --git a/src/mame/machine/xavix2002_io.cpp b/src/mame/machine/xavix2002_io.cpp
index 63cc244fdfb..dba15cd36e0 100644
--- a/src/mame/machine/xavix2002_io.cpp
+++ b/src/mame/machine/xavix2002_io.cpp
@@ -59,7 +59,6 @@ WRITE8_MEMBER(xavix2002_io_device::pio_dir_w)
 READ8_MEMBER(xavix2002_io_device::pio_dir_r)
 {
 	LOG("%s: superxavix pio_dir_r (port %d)\n", machine().describe_context(), offset);
-
 	uint8_t ret = 0x00;
 
 	if (offset < 3)
@@ -78,20 +77,33 @@ WRITE8_MEMBER(xavix2002_io_device::pio_out_w)
 	{
 		m_sx_pio_out[offset] = data;
 
-		// look at direction register and output
+		// TODO: look at direction register
+
+		uint8_t outdata = m_sx_pio_out[offset];
+
+		switch (offset)
+		{
+			case 0: m_out0_cb(space,0,outdata); break;
+			case 1: m_out1_cb(space,0,outdata); break;
+			case 2: m_out2_cb(space,0,outdata); break;
+			default: break;
+		}
 	}
 }
 
 READ8_MEMBER(xavix2002_io_device::pio_out_r)
 {
+	// what does this actually read?
+
 	LOG("%s: superxavix pio_out_r (port %d)\n", machine().describe_context(), offset);
+	return 0x00;
 
-	uint8_t ret = 0x00;
+//	uint8_t ret = 0x00;
 
-	if (offset<3)
-		ret = m_sx_pio_out[offset];
+//	if (offset<3)
+//		ret = m_sx_pio_out[offset];
 
-	return ret;
+//	return ret;
 }