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-rw-r--r--src/mess/machine/c64/4cga.c115
1 files changed, 115 insertions, 0 deletions
diff --git a/src/mess/machine/c64/4cga.c b/src/mess/machine/c64/4cga.c
new file mode 100644
index 00000000000..ecbcc25a2f8
--- /dev/null
+++ b/src/mess/machine/c64/4cga.c
@@ -0,0 +1,115 @@
+/**********************************************************************
+
+ Classical Games/Protovision 4 Player Interface emulation
+
+ http://www.protovision-online.com/hardw/4_player.htm
+ http://hitmen.c02.at/html/hardware.html
+
+ Copyright MESS Team.
+ Visit http://mamedev.org for licensing and usage restrictions.
+
+**********************************************************************/
+
+#include "4cga.h"
+
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type C64_4CGA = &device_creator<c64_4cga_device>;
+
+
+static INPUT_PORTS_START( c64_4player )
+ PORT_START("JOY3")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(1)
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(1)
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(1)
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(1)
+ PORT_BIT( 0xf0, IP_ACTIVE_LOW, IPT_UNUSED )
+
+ PORT_START("JOY4")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(2)
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(2)
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(2)
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(2)
+ PORT_BIT( 0xf0, IP_ACTIVE_LOW, IPT_UNUSED )
+
+ PORT_START("FIRE")
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1)
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)
+ PORT_BIT( 0xcf, 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 clock) :
+ device_t(mconfig, C64_4CGA, "C64 Protovision 4 Player Interface", tag, owner, clock, "c64_4cga", __FILE__),
+ device_c64_user_port_interface(mconfig, *this),
+ m_fire(*this, "FIRE"),
+ m_joy3(*this, "JOY3"),
+ m_joy4(*this, "JOY4"),
+ m_port(0)
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void c64_4cga_device::device_start()
+{
+ // state saving
+ save_item(NAME(m_port));
+}
+
+
+//-------------------------------------------------
+// c64_pb_r - port B read
+//-------------------------------------------------
+
+UINT8 c64_4cga_device::c64_pb_r(address_space &space, offs_t offset)
+{
+ UINT8 data = m_fire->read();
+
+ if (m_port)
+ {
+ data &= m_joy3->read();
+ }
+ else
+ {
+ data &= m_joy4->read();
+ }
+
+ return data;
+}
+
+
+//-------------------------------------------------
+// c64_pb_w - port B write
+//-------------------------------------------------
+
+void c64_4cga_device::c64_pb_w(address_space &space, offs_t offset, UINT8 data)
+{
+ m_port = BIT(data, 7);
+}