diff options
Diffstat (limited to 'src/devices/bus/c64/midi_sci.c')
-rw-r--r-- | src/devices/bus/c64/midi_sci.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/src/devices/bus/c64/midi_sci.c b/src/devices/bus/c64/midi_sci.c new file mode 100644 index 00000000000..40e2c56cbfc --- /dev/null +++ b/src/devices/bus/c64/midi_sci.c @@ -0,0 +1,151 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************** + + Sequential Circuits MIDI Interface cartridge emulation + +**********************************************************************/ + +#include "midi_sci.h" +#include "machine/clock.h" +#include "bus/midi/midi.h" + + + +//************************************************************************** +// MACROS/CONSTANTS +//************************************************************************** + +#define MC6850_TAG "mc6850" + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type C64_MIDI_SCI = &device_creator<c64_sequential_midi_cartridge_device>; + + +WRITE_LINE_MEMBER( c64_sequential_midi_cartridge_device::acia_irq_w ) +{ + m_slot->irq_w(state); +} + +WRITE_LINE_MEMBER( c64_sequential_midi_cartridge_device::write_acia_clock ) +{ + m_acia->write_txc(state); + m_acia->write_rxc(state); +} + + +//------------------------------------------------- +// MACHINE_CONFIG_FRAGMENT( c64_sequential_midi ) +//------------------------------------------------- + +static MACHINE_CONFIG_FRAGMENT( c64_sequential_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_sequential_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_sequential_midi_cartridge_device, write_acia_clock)) +MACHINE_CONFIG_END + + +//------------------------------------------------- +// machine_config_additions - device-specific +// machine configurations +//------------------------------------------------- + +machine_config_constructor c64_sequential_midi_cartridge_device::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( c64_sequential_midi ); +} + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// c64_sequential_midi_cartridge_device - constructor +//------------------------------------------------- + +c64_sequential_midi_cartridge_device::c64_sequential_midi_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, C64_MIDI_SCI, "C64 Sequential Circuits MIDI", tag, owner, clock, "c64_midisci", __FILE__), + device_c64_expansion_card_interface(mconfig, *this), + m_acia(*this, MC6850_TAG) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void c64_sequential_midi_cartridge_device::device_start() +{ + // state saving +} + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void c64_sequential_midi_cartridge_device::device_reset() +{ + m_acia->reset(); +} + + +//------------------------------------------------- +// c64_cd_r - cartridge data read +//------------------------------------------------- + +UINT8 c64_sequential_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 2: + data = m_acia->status_r(space, 0); + break; + + case 3: + data = m_acia->data_r(space, 0); + break; + } + } + + return data; +} + + +//------------------------------------------------- +// c64_cd_w - cartridge data write +//------------------------------------------------- + +void c64_sequential_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: + m_acia->control_w(space, 0, data); + break; + + case 1: + m_acia->data_w(space, 0, data); + break; + } + } +} |