diff options
Diffstat (limited to 'src/devices/bus/coco/coco_midi.cpp')
-rw-r--r-- | src/devices/bus/coco/coco_midi.cpp | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/src/devices/bus/coco/coco_midi.cpp b/src/devices/bus/coco/coco_midi.cpp new file mode 100644 index 00000000000..6bb27eb5456 --- /dev/null +++ b/src/devices/bus/coco/coco_midi.cpp @@ -0,0 +1,112 @@ +// license:BSD-3-Clause +// copyright-holders:tim lindner +/*************************************************************************** + + coco_midi.cpp + + Emulation of Rutherford Research's Midi Pak and also compatible with + Go4Retro's MIDI Maestro. + +***************************************************************************/ + +#include "emu.h" +#include "coco_midi.h" + +#include "machine/6850acia.h" +#include "machine/clock.h" +#include "bus/midi/midi.h" + +// ======================> coco_midi_device + +class coco_midi_device : + public device_t, + public device_cococart_interface +{ + public: + // construction/destruction + coco_midi_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock); + + protected: + coco_midi_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock); + virtual void device_start() override; + + // optional information overrides + virtual void device_add_mconfig(machine_config &config) override; + required_device<acia6850_device> m_acia; + DECLARE_WRITE_LINE_MEMBER( acia_irq_w ); + + private: + required_device<midi_port_device> m_mdthru; +}; + +class dragon_midi_device : public coco_midi_device +{ + public: + // construction/destruction + dragon_midi_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock); + + protected: + dragon_midi_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock); + virtual void device_start() override; +}; + +coco_midi_device::coco_midi_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock) + : device_t(mconfig, type, tag, owner, clock) + , device_cococart_interface(mconfig, *this ) + , m_acia(*this, "mc6850") + , m_mdthru(*this, "mdthru") +{ +} + +coco_midi_device::coco_midi_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) + : coco_midi_device(mconfig, COCO_MIDI, tag, owner, clock) +{ +} + +void coco_midi_device::device_add_mconfig(machine_config &config) +{ + ACIA6850(config, m_acia).txd_handler().set("mdout", FUNC(midi_port_device::write_txd)); + m_acia->irq_handler().set(FUNC(coco_midi_device::acia_irq_w)); + + midi_port_device &mdin(MIDI_PORT(config, "mdin", midiin_slot, "midiin")); + mdin.rxd_handler().set(m_acia, FUNC(acia6850_device::write_rxd)); + mdin.rxd_handler().append(m_mdthru, FUNC(midi_port_device::write_txd)); + MIDI_PORT(config, m_mdthru, midiout_slot, "midiout"); + MIDI_PORT(config, "mdout", midiout_slot, "midiout"); + + clock_device &acia_clock(CLOCK(config, "acia_clock", 31250*16)); + acia_clock.signal_handler().set(m_acia, FUNC(acia6850_device::write_txc)); + acia_clock.signal_handler().append(m_acia, FUNC(acia6850_device::write_rxc)); +} + +void coco_midi_device::device_start() +{ + install_readwrite_handler(0xff6e, 0xff6f, + read8sm_delegate(m_acia, FUNC(acia6850_device::read)), + write8sm_delegate(m_acia, FUNC(acia6850_device::write))); +} + +WRITE_LINE_MEMBER(coco_midi_device::acia_irq_w) +{ + set_line_value(line::CART, state == 0); +} + +dragon_midi_device::dragon_midi_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock) + : coco_midi_device(mconfig, type, tag, owner, clock) +{ +} + +dragon_midi_device::dragon_midi_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) + : dragon_midi_device(mconfig, DRAGON_MIDI, tag, owner, clock) +{ +} + +void dragon_midi_device::device_start() +{ + install_readwrite_handler(0xff74, 0xff75, + read8sm_delegate(m_acia, FUNC(acia6850_device::read)), + write8sm_delegate(m_acia, FUNC(acia6850_device::write))); +} + +DEFINE_DEVICE_TYPE(COCO_MIDI, coco_midi_device, "coco_midi", "CoCo MIDI PAK"); +DEFINE_DEVICE_TYPE(DRAGON_MIDI, dragon_midi_device, "dragon_midi", "Dragon MIDI PAK"); |