diff --git a/scripts/target/mame/mess.lua b/scripts/target/mame/mess.lua
index 699573720dd..0c3aa380f70 100644
--- a/scripts/target/mame/mess.lua
+++ b/scripts/target/mame/mess.lua
@@ -3324,6 +3324,7 @@ files {
 	MAME_DIR .. "src/mame/drivers/roland_tb303.cpp",
 	MAME_DIR .. "src/mame/drivers/roland_tr606.cpp",
 	MAME_DIR .. "src/mame/drivers/roland_tr707.cpp",
+	MAME_DIR .. "src/mame/drivers/roland_tr909.cpp",
 	MAME_DIR .. "src/mame/drivers/roland_u20.cpp",
 	MAME_DIR .. "src/mame/audio/bu3905.cpp",
 	MAME_DIR .. "src/mame/audio/bu3905.h",
diff --git a/src/mame/drivers/roland_tr909.cpp b/src/mame/drivers/roland_tr909.cpp
new file mode 100644
index 00000000000..3b39c59fbd4
--- /dev/null
+++ b/src/mame/drivers/roland_tr909.cpp
@@ -0,0 +1,293 @@
+// license:BSD-3-Clause
+// copyright-holders:AJR
+/***************************************************************************
+
+    Skeleton driver for Roland TR-909 drum machine.
+
+***************************************************************************/
+
+#include "emu.h"
+#include "bus/generic/slot.h"
+#include "cpu/upd7810/upd7810.h"
+#include "machine/nvram.h"
+
+class roland_tr909_state : public driver_device
+{
+public:
+	roland_tr909_state(const machine_config &mconfig, device_type type, const char *tag)
+		: driver_device(mconfig, type, tag)
+		, m_cartslot(*this, "cartslot")
+		, m_inputs(*this, "IN%u", 1U)
+		, m_porta(0)
+		, m_portb(0)
+	{
+	}
+
+	void tr909(machine_config &config);
+
+protected:
+	virtual void machine_start() override;
+	virtual void machine_reset() override;
+
+private:
+	void dac1_w(u8 data);
+	void dac2_w(u8 data);
+	void dac3_w(u8 data);
+	void dac4_w(u8 data);
+	void dac5_w(u8 data);
+	void dac6_w(u8 data);
+	void dac7_w(u8 data);
+	void dac8_w(u8 data);
+	void trig1_w(u8 data);
+	void trig2_w(u8 data);
+
+	void pa_w(u8 data);
+	void pb_w(u8 data);
+	u8 switches_r();
+	u8 cart_sense_r();
+
+	void tr909_mem(address_map &map);
+
+	required_device<generic_cartslot_device> m_cartslot;
+	required_ioport_array<5> m_inputs;
+
+	u8 m_porta;
+	u8 m_portb;
+};
+
+
+void roland_tr909_state::machine_start()
+{
+	save_item(NAME(m_porta));
+	save_item(NAME(m_portb));
+}
+
+void roland_tr909_state::machine_reset()
+{
+	dac1_w(0);
+	dac2_w(0);
+	dac3_w(0);
+	dac4_w(0);
+	dac5_w(0);
+	dac6_w(0);
+	dac7_w(0);
+	dac8_w(0);
+	trig1_w(0);
+	trig2_w(0);
+}
+
+
+void roland_tr909_state::dac1_w(u8 data)
+{
+	logerror("%s: DAC 1 = %02X\n", machine().describe_context(), data & 0x7e);
+}
+
+void roland_tr909_state::dac2_w(u8 data)
+{
+	logerror("%s: DAC 2 = %02X\n", machine().describe_context(), data & 0x7e);
+}
+
+void roland_tr909_state::dac3_w(u8 data)
+{
+	logerror("%s: DAC 3 = %02X\n", machine().describe_context(), data & 0x7e);
+}
+
+void roland_tr909_state::dac4_w(u8 data)
+{
+	logerror("%s: DAC 4 = %02X\n", machine().describe_context(), data & 0x7e);
+}
+
+void roland_tr909_state::dac5_w(u8 data)
+{
+	logerror("%s: DAC 5 = %02X\n", machine().describe_context(), data & 0x7e);
+}
+
+void roland_tr909_state::dac6_w(u8 data)
+{
+	logerror("%s: DAC 6 = %02X\n", machine().describe_context(), data & 0x7e);
+}
+
+void roland_tr909_state::dac7_w(u8 data)
+{
+	logerror("%s: DAC 7 = %02X\n", machine().describe_context(), data & 0x7e);
+}
+
+void roland_tr909_state::dac8_w(u8 data)
+{
+	logerror("%s: DAC 8 = %02X\n", machine().describe_context(), data & 0x7e);
+}
+
+void roland_tr909_state::trig1_w(u8 data)
+{
+	// D6 is unused
+	logerror("%s: Trigger 1 = %02X\n", machine().describe_context(), data & 0x3e);
+}
+
+void roland_tr909_state::trig2_w(u8 data)
+{
+	logerror("%s: Trigger 2 = %02X\n", machine().describe_context(), data & 0x7e);
+}
+
+
+void roland_tr909_state::pa_w(u8 data)
+{
+	// TODO: LED matrix and 4511 digits
+	m_porta = data;
+}
+
+void roland_tr909_state::pb_w(u8 data)
+{
+	// TODO: LED matrix, 4511 LE and tape outputs
+	m_portb = data;
+}
+
+u8 roland_tr909_state::switches_r()
+{
+	u8 data = 0xff;
+	for (int i = 0; i < 5; i++)
+		if (!BIT(m_porta, i))
+			data &= m_inputs[i]->read();
+
+	return data;
+}
+
+u8 roland_tr909_state::cart_sense_r()
+{
+	// TODO
+	return 0;
+}
+
+
+void roland_tr909_state::tr909_mem(address_map &map)
+{
+	map(0x0000, 0x1fff).rom().region("firmware", 0);
+	map(0x2000, 0x3fff).ram().share("nvram");
+	map(0x4000, 0x4000).mirror(0x1fff).r(FUNC(roland_tr909_state::switches_r));
+	map(0x4001, 0x4001).mirror(0x1ff0).w(FUNC(roland_tr909_state::dac1_w));
+	map(0x4002, 0x4002).mirror(0x1ff0).w(FUNC(roland_tr909_state::dac2_w));
+	map(0x4003, 0x4003).mirror(0x1ff0).w(FUNC(roland_tr909_state::dac3_w));
+	map(0x4004, 0x4004).mirror(0x1ff0).w(FUNC(roland_tr909_state::dac4_w));
+	map(0x4005, 0x4005).mirror(0x1ff0).w(FUNC(roland_tr909_state::dac5_w));
+	map(0x4006, 0x4006).mirror(0x1ff0).w(FUNC(roland_tr909_state::dac6_w));
+	map(0x4007, 0x4007).mirror(0x1ff0).w(FUNC(roland_tr909_state::dac7_w));
+	map(0x4008, 0x4008).mirror(0x1ff0).w(FUNC(roland_tr909_state::dac8_w));
+	map(0x4009, 0x4009).mirror(0x1ff0).w(FUNC(roland_tr909_state::trig1_w));
+	map(0x400a, 0x400a).mirror(0x1ff0).w(FUNC(roland_tr909_state::trig2_w));
+	map(0x6000, 0x7fff).unmaprw(); // cartridge
+}
+
+
+static INPUT_PORTS_START(tr909)
+	PORT_START("IN1")
+	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("SW1")
+	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("SW2")
+	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("SW3")
+	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("SW4")
+	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("SW5")
+	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("SW6")
+	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("SW7")
+	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("SW8")
+
+	PORT_START("IN2")
+	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("SW9")
+	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("SW10")
+	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("SW11")
+	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("SW12")
+	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("SW13")
+	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("SW14")
+	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("SW15")
+	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("SW16")
+
+	PORT_START("IN3")
+	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Shift")
+	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Scale")
+	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_UNUSED)
+	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Inst Select")
+	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Shuffle/Flam")
+	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Last Step")
+	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Stop/Cont")
+	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Start")
+
+	PORT_START("IN4")
+	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Clear")
+	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Track 1")
+	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Track 2")
+	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Track 3")
+	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Track 4")
+	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Pattern 1")
+	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Pattern 2")
+	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Pattern 3")
+
+	PORT_START("IN5")
+	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Enter/Accent")
+	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Tape Sync")
+	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Cycle")
+	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Available Meas")
+	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Fwd")
+	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Back")
+	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Tempo")
+	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_OTHER) PORT_NAME("Ext Inst")
+
+	PORT_START("TEMPO")
+	PORT_BIT(0xff, IP_ACTIVE_HIGH, IPT_UNKNOWN) // TODO: analog
+
+	PORT_START("TOTAL")
+	PORT_BIT(0xff, IP_ACTIVE_HIGH, IPT_UNKNOWN) // TODO: analog
+INPUT_PORTS_END
+
+
+static void ram_carts(device_slot_interface &device)
+{
+}
+
+void roland_tr909_state::tr909(machine_config &config)
+{
+	upd7810_device &maincpu(UPD7810(config, "maincpu", 12_MHz_XTAL));
+	maincpu.set_addrmap(AS_PROGRAM, &roland_tr909_state::tr909_mem);
+	maincpu.pa_out_cb().set(FUNC(roland_tr909_state::pa_w));
+	maincpu.pb_out_cb().set(FUNC(roland_tr909_state::pb_w));
+	//maincpu.pc_in_cb().set(FUNC(roland_tr909_state::tr909_portc_r));
+	//maincpu.pc_out_cb().set(FUNC(roland_tr909_state::tr909_portc_w));
+	maincpu.an0_func().set_ioport("TEMPO");
+	maincpu.an1_func().set(FUNC(roland_tr909_state::cart_sense_r));
+	maincpu.an2_func().set_constant(0);
+	maincpu.an3_func().set_ioport("TOTAL");
+	maincpu.an4_func().set_constant(0);
+	maincpu.an5_func().set_constant(0);
+	maincpu.an6_func().set_constant(0);
+	maincpu.an7_func().set_constant(0);
+
+	NVRAM(config, "nvram", nvram_device::DEFAULT_ALL_0); // TC5565PL-15 + battery
+
+	// no screen
+
+	GENERIC_CARTSLOT(config, m_cartslot, ram_carts, "tr909_cart", "bin");
+
+	//SOFTWARE_LIST(config, "cart_list", "tr909");
+}
+
+
+ROM_START(tr909)
+	ROM_REGION(0x2000, "firmware", 0)
+	//cpu is a D7811G 037 with 4096w of ROM
+	//mode pins are both pulled to 5v
+
+	//version 0 and 1 firmware also exist
+	ROM_SYSTEM_BIOS(0, "v4", "v4.0")
+	ROMX_LOAD("tr909_v4.ic609", 0, 0x2000, CRC(a9b45f30) SHA1(b94374e2cd6b5a6c405da4fa7793c98c0a6015c4), ROM_BIOS(0))
+	ROM_SYSTEM_BIOS(1, "v1", "v1.0")
+	ROMX_LOAD("tr909_v1.ic609", 0, 0x2000, CRC(bfb9682b) SHA1(bcd754900574d1861034af8056574ffa77db3067), ROM_BIOS(1))
+
+	//samples
+	ROM_REGION(0x8000, "hihat", 0)
+	ROM_LOAD("hn61256p__c43.ic69", 0, 0x8000, CRC(2aaae11b) SHA1(22a34d603e78673bb096f5e56a8971afe14d8fee))
+
+	ROM_REGION(0x8000, "crash", 0)
+	ROM_LOAD("hn61256p__c42.ic62", 0, 0x8000, CRC(dc61cf1a) SHA1(bc730107b0c391f4879c9777a3e85f3e57f3aad6))
+
+	ROM_REGION(0x8000, "ride", 0)
+	ROM_LOAD("hn61256p__c44.ic54", 0, 0x8000, CRC(01a9b435) SHA1(daa54c58c7e3ae3398f125568537ec82d5bd1dfd))
+ROM_END
+
+
+SYST(1984, tr909, 0, 0, tr909, tr909, roland_tr909_state, empty_init, "Roland", "TR-909 Rhythm Composer", MACHINE_NOT_WORKING | MACHINE_NO_SOUND)
diff --git a/src/mame/mame.lst b/src/mame/mame.lst
index c5ba69cb6ff..cb95c798ba7 100644
--- a/src/mame/mame.lst
+++ b/src/mame/mame.lst
@@ -34846,6 +34846,9 @@ tr606                           // Roland
 tr707                           //
 tr727                           //
 
+@source:roland_tr909.cpp
+tr909                           //
+
 @source:roland_u20.cpp
 u20                             //
 u220                            //
diff --git a/src/mame/mess.flt b/src/mame/mess.flt
index 134f52d74a4..377208bcedd 100644
--- a/src/mame/mess.flt
+++ b/src/mame/mess.flt
@@ -795,6 +795,7 @@ roland_sc88.cpp
 roland_tb303.cpp
 roland_tr606.cpp
 roland_tr707.cpp
+roland_tr909.cpp
 roland_u20.cpp
 rt1715.cpp
 rvoice.cpp