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-rw-r--r--src/mess/machine/c64/midi_passport.c255
1 files changed, 255 insertions, 0 deletions
diff --git a/src/mess/machine/c64/midi_passport.c b/src/mess/machine/c64/midi_passport.c
new file mode 100644
index 00000000000..a3074c1ae20
--- /dev/null
+++ b/src/mess/machine/c64/midi_passport.c
@@ -0,0 +1,255 @@
+/**********************************************************************
+
+ Passport/Syntech MIDI Interface cartridge emulation
+
+ Copyright MESS Team.
+ Visit http://mamedev.org for licensing and usage restrictions.
+
+**********************************************************************/
+
+#include "midi_passport.h"
+
+
+
+//**************************************************************************
+// MACROS/CONSTANTS
+//**************************************************************************
+
+#define MC6840_TAG "mc6840"
+#define MC6850_TAG "mc6850"
+
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type C64_MIDI_PASSPORT = &device_creator<c64_passport_midi_cartridge_device>;
+
+
+//-------------------------------------------------
+// ptm6840_interface ptm_intf
+//-------------------------------------------------
+
+WRITE_LINE_MEMBER( c64_passport_midi_cartridge_device::ptm_irq_w )
+{
+ m_ptm_irq = state;
+
+ m_slot->irq_w(m_ptm_irq || m_acia_irq);
+}
+
+static const ptm6840_interface ptm_intf =
+{
+ 1021800.0f,
+ { 1021800.0f, 1021800.0f, 1021800.0f },
+ { DEVCB_NULL, DEVCB_NULL, DEVCB_NULL },
+ DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, c64_passport_midi_cartridge_device, ptm_irq_w)
+};
+
+
+//-------------------------------------------------
+// ACIA6850_INTERFACE( acia_intf )
+//-------------------------------------------------
+
+WRITE_LINE_MEMBER( c64_passport_midi_cartridge_device::acia_irq_w )
+{
+ m_acia_irq = state;
+
+ m_slot->irq_w(m_ptm_irq || m_acia_irq);
+}
+
+READ_LINE_MEMBER( c64_passport_midi_cartridge_device::rx_in )
+{
+ return m_rx_state;
+}
+
+WRITE_LINE_MEMBER( c64_passport_midi_cartridge_device::tx_out )
+{
+ m_mdout->tx(state);
+}
+
+static ACIA6850_INTERFACE( acia_intf )
+{
+ 500000,
+ 0, // rx clock (we manually clock rx)
+ DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, c64_passport_midi_cartridge_device, rx_in),
+ DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, c64_passport_midi_cartridge_device, tx_out),
+ DEVCB_NULL,
+ DEVCB_NULL,
+ DEVCB_NULL,
+ DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, c64_passport_midi_cartridge_device, acia_irq_w)
+};
+
+
+//-------------------------------------------------
+// SLOT_INTERFACE( midiin_slot )
+//-------------------------------------------------
+
+static SLOT_INTERFACE_START( midiin_slot )
+ SLOT_INTERFACE("midiin", MIDIIN_PORT)
+SLOT_INTERFACE_END
+
+WRITE_LINE_MEMBER( c64_passport_midi_cartridge_device::midi_rx_w )
+{
+ m_rx_state = state;
+
+ for (int i = 0; i < 16; i++) // divider is set to 16
+ {
+ m_acia->rx_clock_in();
+ }
+}
+
+static const serial_port_interface midiin_intf =
+{
+ DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, c64_passport_midi_cartridge_device, midi_rx_w)
+};
+
+
+//-------------------------------------------------
+// SLOT_INTERFACE( midiout_slot )
+//-------------------------------------------------
+
+static SLOT_INTERFACE_START( midiout_slot )
+ SLOT_INTERFACE("midiout", MIDIOUT_PORT)
+SLOT_INTERFACE_END
+
+static const serial_port_interface midiout_intf =
+{
+ DEVCB_NULL // midi out ports don't transmit inward
+};
+
+
+//-------------------------------------------------
+// MACHINE_CONFIG_FRAGMENT( c64_passport_midi )
+//-------------------------------------------------
+
+static MACHINE_CONFIG_FRAGMENT( c64_passport_midi )
+ MCFG_ACIA6850_ADD(MC6850_TAG, acia_intf)
+ MCFG_PTM6840_ADD(MC6840_TAG, ptm_intf)
+
+ MCFG_SERIAL_PORT_ADD("mdin", midiin_intf, midiin_slot, "midiin")
+ MCFG_SERIAL_PORT_ADD("mdout", midiout_intf, midiout_slot, "midiout")
+MACHINE_CONFIG_END
+
+
+//-------------------------------------------------
+// machine_config_additions - device-specific
+// machine configurations
+//-------------------------------------------------
+
+machine_config_constructor c64_passport_midi_cartridge_device::device_mconfig_additions() const
+{
+ return MACHINE_CONFIG_NAME( c64_passport_midi );
+}
+
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// c64_passport_midi_cartridge_device - constructor
+//-------------------------------------------------
+
+c64_passport_midi_cartridge_device::c64_passport_midi_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, C64_MIDI_PASSPORT, "C64 Passport MIDI", tag, owner, clock, "c64_midipp", __FILE__),
+ device_c64_expansion_card_interface(mconfig, *this),
+ m_acia(*this, MC6850_TAG),
+ m_ptm(*this, MC6840_TAG),
+ m_mdout(*this, "mdout"),
+ m_ptm_irq(CLEAR_LINE),
+ m_acia_irq(CLEAR_LINE),
+ m_rx_state(0)
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void c64_passport_midi_cartridge_device::device_start()
+{
+ // state saving
+ save_item(NAME(m_ptm_irq));
+ save_item(NAME(m_acia_irq));
+ save_item(NAME(m_rx_state));
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void c64_passport_midi_cartridge_device::device_reset()
+{
+ m_acia->reset();
+ m_ptm->reset();
+
+ m_rx_state = 0;
+}
+
+
+//-------------------------------------------------
+// c64_cd_r - cartridge data read
+//-------------------------------------------------
+
+UINT8 c64_passport_midi_cartridge_device::c64_cd_r(address_space &space, offs_t offset, UINT8 data, int sphi2, int ba, int roml, int romh, int io1, int io2)
+{
+ if (!io1)
+ {
+ switch (offset & 0xff)
+ {
+ case 0: case 1: case 2: case 3:
+ case 4: case 5: case 6: case 7:
+ data = m_ptm->read(space, offset & 0x07);
+ break;
+
+ case 8:
+ data = m_acia->status_read(space, 0);
+ break;
+
+ case 9:
+ data = m_acia->data_read(space, 0);
+ break;
+ }
+ }
+
+ return data;
+}
+
+
+//-------------------------------------------------
+// c64_cd_w - cartridge data write
+//-------------------------------------------------
+
+void c64_passport_midi_cartridge_device::c64_cd_w(address_space &space, offs_t offset, UINT8 data, int sphi2, int ba, int roml, int romh, int io1, int io2)
+{
+ if (!io1)
+ {
+ switch (offset & 0xff)
+ {
+ case 0: case 1: case 2: case 3:
+ case 4: case 5: case 6: case 7:
+ m_ptm->write(space, offset & 0x07, data);
+ break;
+
+ case 8:
+ m_acia->control_write(space, 0, data);
+ break;
+
+ case 9:
+ m_acia->data_write(space, 0, data);
+ break;
+
+ case 0x30:
+ // Drum sync SET
+ break;
+
+ case 0x38:
+ // Drum sync CLEAR
+ break;
+ }
+ }
+}