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diff --git a/src/devices/bus/nes_ctrl/4score.cpp b/src/devices/bus/nes_ctrl/4score.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Fabio Priuli
+/**********************************************************************
+
+ Nintendo Entertainment System Four Score Adapter
+
+
+ TODO: current implementation is a HACK, due to limitations of the
+ slot system!
+ A real Four Score would be connected to both the controller ports of
+ the NES, but current core cannot emulate something like this until
+ devices can live their own life and being connected to other devices
+ at request.
+ In current implementation the device has to be mounted separately in
+ the two ports and each enables 2 inputs (this is more or less as hacky
+ as the non-slot previous one, where the 4 ports were always available
+ to the emulated system, but it's not a great consolation :( )
+ Two subdevices are currently used so to warn the user that the first
+ one gives P1+P3 inputs and the second one gives P2+P4 inputs.
+ For the same reason, we don't currently emulate the 2P/4P switch,
+ since we could at best have two switches to disable the second player
+ inputs.
+
+ Note: Two Pads are hardcoded in inputs below, instead of acting as
+ passthrough for 2 standard joypad devices, in order to show in the
+ internal UI that they belong to P1+P3 and P2+P4, otherwise they would
+ be listed as P1+P2 and P3+P4 respectively. This *HAS* to be changed
+ once the slot support in the code has improved (4 standard joypads
+ shall be attached to the unit!)
+
+**********************************************************************/
+
+#include "4score.h"
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type NES_4SCORE_P1P3 = &device_creator<nes_4score_p1p3_device>;
+const device_type NES_4SCORE_P2P4 = &device_creator<nes_4score_p2p4_device>;
+
+
+static INPUT_PORTS_START( nes_4score_p1p3 )
+ PORT_START("PAD1")
+ PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_NAME("A") PORT_PLAYER(1)
+ PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_NAME("B") PORT_PLAYER(1)
+ PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_SELECT ) PORT_PLAYER(1)
+ PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_START ) PORT_PLAYER(1)
+ PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP ) PORT_PLAYER(1)
+ PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN ) PORT_PLAYER(1)
+ PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) PORT_PLAYER(1)
+ PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(1)
+
+ PORT_START("PAD3")
+ PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_NAME("A") PORT_PLAYER(3)
+ PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_NAME("B") PORT_PLAYER(3)
+ PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_SELECT ) PORT_PLAYER(3)
+ PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_START ) PORT_PLAYER(3)
+ PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP ) PORT_PLAYER(3)
+ PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN ) PORT_PLAYER(3)
+ PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) PORT_PLAYER(3)
+ PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(3)
+INPUT_PORTS_END
+
+
+static INPUT_PORTS_START( nes_4score_p2p4 )
+ PORT_START("PAD2")
+ PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_NAME("A") PORT_PLAYER(2)
+ PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_NAME("B") PORT_PLAYER(2)
+ PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_SELECT ) PORT_PLAYER(2)
+ PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_START ) PORT_PLAYER(2)
+ PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP ) PORT_PLAYER(2)
+ PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN ) PORT_PLAYER(2)
+ PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) PORT_PLAYER(2)
+ PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(2)
+
+ PORT_START("PAD4")
+ PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_NAME("A") PORT_PLAYER(4)
+ PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_NAME("B") PORT_PLAYER(4)
+ PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_SELECT ) PORT_PLAYER(4)
+ PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_START ) PORT_PLAYER(4)
+ PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP ) PORT_PLAYER(4)
+ PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN ) PORT_PLAYER(4)
+ PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) PORT_PLAYER(4)
+ PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_PLAYER(4)
+INPUT_PORTS_END
+
+
+//-------------------------------------------------
+// input_ports - device-specific input ports
+//-------------------------------------------------
+
+ioport_constructor nes_4score_p1p3_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME( nes_4score_p1p3 );
+}
+
+ioport_constructor nes_4score_p2p4_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME( nes_4score_p2p4 );
+}
+
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// nes_4score_device - constructor
+//-------------------------------------------------
+
+nes_4score_device::nes_4score_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source)
+ : device_t(mconfig, type, name, tag, owner, clock, shortname, source),
+ device_nes_control_port_interface(mconfig, *this)
+{
+}
+
+nes_4score_p1p3_device::nes_4score_p1p3_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ nes_4score_device(mconfig, NES_4SCORE_P1P3, "Nintendo Four Score Adapter P1/P3", tag, owner, clock, "nes_4score_p1p3", __FILE__),
+ m_joypad1(*this, "PAD1"),
+ m_joypad3(*this, "PAD3")
+{
+}
+
+nes_4score_p2p4_device::nes_4score_p2p4_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ nes_4score_device(mconfig, NES_4SCORE_P2P4, "Nintendo Four Score Adapter P2/P4", tag, owner, clock, "nes_4score_p2p4", __FILE__),
+ m_joypad2(*this, "PAD2"),
+ m_joypad4(*this, "PAD4")
+{
+}
+
+
+//-------------------------------------------------
+// device_start
+//-------------------------------------------------
+
+void nes_4score_device::device_start()
+{
+ save_item(NAME(m_latch));
+}
+
+
+//-------------------------------------------------
+// device_reset
+//-------------------------------------------------
+
+void nes_4score_device::device_reset()
+{
+ m_latch = 0;
+}
+
+
+//-------------------------------------------------
+// read
+//-------------------------------------------------
+
+UINT8 nes_4score_device::read_bit0()
+{
+ UINT8 ret = m_latch & 1;
+ m_latch >>= 1;
+ return ret;
+}
+
+//-------------------------------------------------
+// write
+//-------------------------------------------------
+
+void nes_4score_p1p3_device::write(UINT8 data)
+{
+ if (data & 0x01)
+ return;
+
+ // P3 & P4 inputs in NES Four Score are read serially with P1 & P2
+ m_latch = m_joypad1->read();
+ m_latch |= (m_joypad3->read() << 8); // pad 3
+ m_latch |= (0x08 << 16); // signature
+}
+
+void nes_4score_p2p4_device::write(UINT8 data)
+{
+ if (data & 0x01)
+ return;
+
+ // P3 & P4 inputs in NES Four Score are read serially with P1 & P2
+ m_latch = m_joypad2->read();
+ m_latch |= (m_joypad4->read() << 8); // pad 4
+ m_latch |= (0x04 << 16); // signature
+}