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diff --git a/src/devices/bus/nes_ctrl/hori.cpp b/src/devices/bus/nes_ctrl/hori.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Fabio Priuli
+/**********************************************************************
+
+ Nintendo Family Computer Hori Twin (and 4P?) adapters
+
+ Emulation of the 4Players adapter is quite pointless: if 2P mode
+ (default mode) it behaves like a Hori Twin adapter, in 4P mode
+ it has P1 and P2 inputs overwriting the inputs coming from the
+ main controllers (possibly creating a bit of confusion, since
+ you get 6 sets of inputs with only 4 acknowledged by the running
+ system).
+ For the moment we keep it available for documentation purposes.
+
+ TODO: find out confirmation whether in 2P mode, inputs from joypads
+ connected to the 4players adapter are really seen as P3 and P4 inputs.
+ it seems the most reasonable setup (so that users with only 2
+ external pads can use the adapter in 4P games), but one never knows...
+
+**********************************************************************/
+
+#include "hori.h"
+#include "joypad.h"
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type NES_HORITWIN = &device_creator<nes_horitwin_device>;
+const device_type NES_HORI4P = &device_creator<nes_hori4p_device>;
+
+
+static INPUT_PORTS_START( nes_hori4p )
+ PORT_START("CONFIG")
+ PORT_CONFNAME( 0x01, 0x00, "4 Players / 2 Players")
+ PORT_CONFSETTING( 0x00, "2 Players" )
+ PORT_CONFSETTING( 0x01, "4 Players" )
+INPUT_PORTS_END
+
+
+//-------------------------------------------------
+// input_ports - device-specific input ports
+//-------------------------------------------------
+
+ioport_constructor nes_hori4p_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME( nes_hori4p );
+}
+
+
+static SLOT_INTERFACE_START( hori_adapter )
+ SLOT_INTERFACE("joypad", NES_JOYPAD)
+SLOT_INTERFACE_END
+
+static MACHINE_CONFIG_FRAGMENT( horitwin )
+ MCFG_FC_EXPANSION_PORT_ADD("port1", hori_adapter, "joypad")
+ MCFG_FC_EXPANSION_PORT_ADD("port2", hori_adapter, "joypad")
+MACHINE_CONFIG_END
+
+static MACHINE_CONFIG_FRAGMENT( hori4p )
+ MCFG_FC_EXPANSION_PORT_ADD("port1", hori_adapter, "joypad")
+ MCFG_FC_EXPANSION_PORT_ADD("port2", hori_adapter, "joypad")
+ MCFG_FC_EXPANSION_PORT_ADD("port3", hori_adapter, "joypad")
+ MCFG_FC_EXPANSION_PORT_ADD("port4", hori_adapter, "joypad")
+MACHINE_CONFIG_END
+
+
+//-------------------------------------------------
+// machine_config_additions - device-specific
+// machine configurations
+//-------------------------------------------------
+
+machine_config_constructor nes_horitwin_device::device_mconfig_additions() const
+{
+ return MACHINE_CONFIG_NAME( horitwin );
+}
+
+machine_config_constructor nes_hori4p_device::device_mconfig_additions() const
+{
+ return MACHINE_CONFIG_NAME( hori4p );
+}
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// nes_horitwin_device - constructor
+//-------------------------------------------------
+
+nes_horitwin_device::nes_horitwin_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, NES_HORITWIN, "Hori Twin Adapter", tag, owner, clock, "nes_horitwin", __FILE__),
+ device_nes_control_port_interface(mconfig, *this),
+ m_port1(*this, "port1"),
+ m_port2(*this, "port2")
+{
+}
+
+nes_hori4p_device::nes_hori4p_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, NES_HORI4P, "Hori 4P Adapter", tag, owner, clock, "nes_hori4p", __FILE__),
+ device_nes_control_port_interface(mconfig, *this),
+ m_port1(*this, "port1"),
+ m_port2(*this, "port2"),
+ m_port3(*this, "port3"),
+ m_port4(*this, "port4"),
+ m_cfg(*this, "CONFIG")
+{
+}
+
+
+//-------------------------------------------------
+// read
+//-------------------------------------------------
+
+UINT8 nes_horitwin_device::read_exp(offs_t offset)
+{
+ UINT8 ret = 0;
+ if (offset == 0) //$4016
+ ret |= (m_port1->read_bit0() << 1);
+ else //$4017
+ ret |= (m_port2->read_bit0() << 1);
+ return ret;
+}
+
+UINT8 nes_hori4p_device::read_exp(offs_t offset)
+{
+ UINT8 ret = 0;
+ if (m_cfg->read() == 0) // 2P
+ {
+ if (offset == 0) //$4016
+ ret |= (m_port1->read_bit0() << 1);
+ else //$4017
+ ret |= (m_port2->read_bit0() << 1);
+ }
+ else // 4P
+ {
+ if (offset == 0) //$4016
+ {
+ ret |= (m_port1->read_bit0() << 0);
+ ret |= (m_port3->read_bit0() << 1);
+ }
+ else //$4017
+ {
+ ret |= (m_port2->read_bit0() << 0);
+ ret |= (m_port4->read_bit0() << 1);
+ }
+ }
+ return ret;
+}
+
+//-------------------------------------------------
+// write
+//-------------------------------------------------
+
+void nes_horitwin_device::write(UINT8 data)
+{
+ m_port1->write(data);
+ m_port2->write(data);
+}
+
+void nes_hori4p_device::write(UINT8 data)
+{
+ m_port1->write(data);
+ m_port2->write(data);
+ m_port3->write(data);
+ m_port4->write(data);
+}