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// license:BSD-3-Clause
// copyright-holders:smf
/**********************************************************************
Classical Games/Protovision 4 Player Interface emulation
http://www.protovision-online.com/hardw/4_player.htm
http://hitmen.c02.at/html/hardware.html
**********************************************************************/
#include "emu.h"
#include "4cga.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(C64_4CGA, c64_4cga_device, "c64_4cga", "C64 Protovision 4 Player Interface")
static INPUT_PORTS_START( c64_4player )
PORT_START("JOY3")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(1) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, c64_4cga_device, write_joy3_0)
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(1) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, c64_4cga_device, write_joy3_1)
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(1) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, c64_4cga_device, write_joy3_2)
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(1) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, c64_4cga_device, write_joy3_3)
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, device_pet_user_port_interface, output_h)
PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_START("JOY4")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(2) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, c64_4cga_device, write_joy4_0)
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(2) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, c64_4cga_device, write_joy4_1)
PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(2) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, c64_4cga_device, write_joy4_2)
PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(2) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, c64_4cga_device, write_joy4_3)
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, device_pet_user_port_interface, output_j)
PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )
INPUT_PORTS_END
//-------------------------------------------------
// input_ports - device-specific input ports
//-------------------------------------------------
ioport_constructor c64_4cga_device::device_input_ports() const
{
return INPUT_PORTS_NAME( c64_4player );
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// c64_4cga_device - constructor
//-------------------------------------------------
c64_4cga_device::c64_4cga_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
device_t(mconfig, C64_4CGA, tag, owner, clock),
device_pet_user_port_interface(mconfig, *this),
m_port(0),
m_joy3(0xf),
m_joy4(0xf)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void c64_4cga_device::device_start()
{
// state saving
save_item(NAME(m_port));
}
//-------------------------------------------------
// update_output
//-------------------------------------------------
void c64_4cga_device::update_output()
{
uint8_t data;
if (m_port)
{
data = m_joy3;
}
else
{
data = m_joy4;
}
output_c((data>>0)&1);
output_d((data>>1)&1);
output_e((data>>2)&1);
output_f((data>>3)&1);
}
//-------------------------------------------------
// c64_pb_w - port B write
//-------------------------------------------------
WRITE_LINE_MEMBER( c64_4cga_device::input_l )
{
m_port = state;
update_output();
}
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