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Diffstat (limited to 'src/mess/machine/c64/4cga.c')
-rw-r--r-- | src/mess/machine/c64/4cga.c | 115 |
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); +} |