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Diffstat (limited to 'src/devices/bus/c64/midi_maplin.cpp')
-rw-r--r--src/devices/bus/c64/midi_maplin.cpp152
1 files changed, 152 insertions, 0 deletions
diff --git a/src/devices/bus/c64/midi_maplin.cpp b/src/devices/bus/c64/midi_maplin.cpp
new file mode 100644
index 00000000000..7a143391129
--- /dev/null
+++ b/src/devices/bus/c64/midi_maplin.cpp
@@ -0,0 +1,152 @@
+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/**********************************************************************
+
+ Maplin MIDI Interface cartridge emulation
+
+**********************************************************************/
+
+#include "midi_maplin.h"
+#include "machine/clock.h"
+#include "bus/midi/midi.h"
+
+
+
+//**************************************************************************
+// MACROS/CONSTANTS
+//**************************************************************************
+
+#define MC6850_TAG "mc6850"
+
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type C64_MIDI_MAPLIN = &device_creator<c64_maplin_midi_cartridge_device>;
+
+
+WRITE_LINE_MEMBER( c64_maplin_midi_cartridge_device::acia_irq_w )
+{
+ m_slot->irq_w(state);
+}
+
+WRITE_LINE_MEMBER( c64_maplin_midi_cartridge_device::write_acia_clock )
+{
+ m_acia->write_txc(state);
+ m_acia->write_rxc(state);
+}
+
+
+//-------------------------------------------------
+// MACHINE_CONFIG_FRAGMENT( c64_maplin_midi )
+//-------------------------------------------------
+
+static MACHINE_CONFIG_FRAGMENT( c64_maplin_midi )
+ MCFG_DEVICE_ADD(MC6850_TAG, ACIA6850, 0)
+ MCFG_ACIA6850_TXD_HANDLER(DEVWRITELINE("mdout", midi_port_device, write_txd))
+ MCFG_ACIA6850_IRQ_HANDLER(WRITELINE(c64_maplin_midi_cartridge_device, acia_irq_w))
+
+ MCFG_MIDI_PORT_ADD("mdin", midiin_slot, "midiin")
+ MCFG_MIDI_RX_HANDLER(DEVWRITELINE(MC6850_TAG, acia6850_device, write_rxd))
+
+ MCFG_MIDI_PORT_ADD("mdout", midiout_slot, "midiout")
+
+ MCFG_DEVICE_ADD("acia_clock", CLOCK, 31250*16)
+ MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE(c64_maplin_midi_cartridge_device, write_acia_clock))
+MACHINE_CONFIG_END
+
+
+//-------------------------------------------------
+// machine_config_additions - device-specific
+// machine configurations
+//-------------------------------------------------
+
+machine_config_constructor c64_maplin_midi_cartridge_device::device_mconfig_additions() const
+{
+ return MACHINE_CONFIG_NAME( c64_maplin_midi );
+}
+
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// c64_maplin_midi_cartridge_device - constructor
+//-------------------------------------------------
+
+c64_maplin_midi_cartridge_device::c64_maplin_midi_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, C64_MIDI_MAPLIN, "C64 Maplin MIDI", tag, owner, clock, "c64_midimap", __FILE__),
+ device_c64_expansion_card_interface(mconfig, *this),
+ m_acia(*this, MC6850_TAG)
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void c64_maplin_midi_cartridge_device::device_start()
+{
+ // state saving
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void c64_maplin_midi_cartridge_device::device_reset()
+{
+ m_acia->reset();
+}
+
+
+//-------------------------------------------------
+// c64_cd_r - cartridge data read
+//-------------------------------------------------
+
+UINT8 c64_maplin_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 (!io2)
+ {
+ switch (offset & 0xff)
+ {
+ case 0:
+ data = m_acia->status_r(space, 0);
+ break;
+
+ case 1:
+ data = m_acia->data_r(space, 0);
+ break;
+ }
+ }
+
+ return data;
+}
+
+
+//-------------------------------------------------
+// c64_cd_w - cartridge data write
+//-------------------------------------------------
+
+void c64_maplin_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 (!io2)
+ {
+ switch (offset & 0xff)
+ {
+ case 0:
+ m_acia->control_w(space, 0, data);
+ break;
+
+ case 1:
+ m_acia->data_w(space, 0, data);
+ break;
+ }
+ }
+}